Test gap dialogs through a real `tractor` actor

Schema checks do not exercise ctx discovery, directional decoding,
stream setup, request correlation or endpoint-finally cleanup.

Boot an isolated child actor around `remote_gap_overlays()` and
drive it through `AnnotClient`. Cancel one published request, leave
its reply queued and prove the next request discards that stale
msg.

Also,
- verify generated request IDs and remote-owner cleanup;
- document automated coverage and broker-backed manual boundaries.

Prompt-IO: ai/prompt-io/opencode/20260817T222036Z_f65df6a1_prompt_io.md

(this patch was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`))

ai/prompt-io/opencode/20260817T222036Z_f65df6a1_prompt_io.md

@@ -0,0 +1,39 @@
+---
+model: openai/gpt-5.6-sol
+service: opencode
+session: unavailable
+timestamp: 2026-08-17T22:20:36Z
+git_ref: f65df6a1
+scope: code
+substantive: true
+raw_file: 20260817T222036Z_f65df6a1_prompt_io.raw.md
+---
+
+## Prompt
+
+Add end-to-end coverage for chart-local gap annotations in the existing
+gap-overlay worktree without disturbing concurrent manual backfiller testing
+in the root checkout.
+
+## Response summary
+
+Adds real offscreen Qt and real Tractor actor integration coverage. The tests
+drive startup registration, PyQtGraph insertion/removal, focused Ctrl-G input,
+history-prepend repositioning, duplicate-FQME chart identity, typed endpoint
+exchange and cancellation with stale-response recovery. Defects exposed by
+those tests are fixed in manager cleanup, Qt geometry notification and PyQt6
+event routing.
+
+## Files changed
+
+- `piker/ui/_gaps.py` - correct PyQtGraph ownership and bounds behavior.
+- `piker/ui/_annotate.py` - notify Qt before reposition geometry changes.
+- `piker/ui/_display.py` - expose deterministic startup registration.
+- `piker/ui/_interaction.py` - focus toggles and PyQt6 event registration.
+- `tests/test_gap_overlays.py` - real Qt and Tractor integration coverage.
+- `plans/opencode/chart-local-gap-overlays.md` - update coverage boundaries.
+- `plans/opencode/chart-local-gap-overlays.summary.md` - update test totals.
+
+## Human edits
+
+None - the changes remain uncommitted for human review.

ai/prompt-io/opencode/20260817T222036Z_f65df6a1_prompt_io.raw.md

@@ -0,0 +1,59 @@
+---
+model: openai/gpt-5.6-sol
+service: opencode
+timestamp: 2026-08-17T22:20:36Z
+git_ref: f65df6a1
+diff_cmd: git diff f65df6a1..HEAD
+---
+
+## Prompt
+
+The user asked whether the chart-local gap annotation feature had complete
+end-to-end coverage, then requested implementation in the existing gap-overlay
+worktree while manual NativeDB/backfiller qualification continued in the root
+checkout. The user initially declined a tests-only Prompt-IO entry. Real Qt
+and Tractor integration tests then exposed production lifecycle and PyQt6
+event-routing defects, making the resulting patch substantive code work and
+requiring this full provenance entry.
+
+## Generated code
+
+> `git diff HEAD~1..HEAD -- piker/ui/_gaps.py`
+
+Removes manager-owned graphics through their `PlotItem`, retains owning-plot
+registrations, and excludes pixel-sized gap arrows from automatic data bounds.
+
+> `git diff HEAD~1..HEAD -- piker/ui/_annotate.py`
+
+Moves Qt geometry-change notification ahead of rectangle and arrow mutation so
+scene spatial indexing follows history-prepend repositioning.
+
+> `git diff HEAD~1..HEAD -- piker/ui/_display.py`
+
+Extracts `_register_gap_overlays()` as the deterministic chart startup seam
+which registers display states and renders default historical gap layers.
+
+> `git diff HEAD~1..HEAD -- piker/ui/_interaction.py`
+
+Adds focused-chart toggle routing, updates the gap keyboard path to PyQt6 event
+enums, and keeps unrelated cached chart states untouched.
+
+> `git diff HEAD~1..HEAD -- tests/test_gap_overlays.py`
+
+Adds offscreen real-Qt manager, startup, keyboard, cached-chart and reposition
+coverage plus a real Tractor actor endpoint/client dialog with deterministic
+cancellation and stale-response recovery.
+
+## Generated architecture output
+
+> `git diff HEAD~1..HEAD -- plans/opencode/chart-local-gap-overlays.md plans/opencode/chart-local-gap-overlays.summary.md`
+
+Records the automated integration boundary and remaining broker-backed manual
+qualification requirements.
+
+## Verification output
+
+The source-isolated non-actor and related suites pass 24 tests with one actor
+case deselected. The isolated actor case passes with one upstream Tractor/Trio
+deprecation warning. Ruff, compileall, import resolution and whitespace checks
+pass. Independent review reports no remaining P1/P2 findings.

piker/ui/_annotate.py

@@ -670,6 +670,11 @@ class GapAnnotations(GraphicsObject):
                 )
             }
 
+        # Notify Qt before mutating anything used by
+        # `boundingRect()`.
+        self.prepareGeometryChange()
+        self._br = None
+
         # rebuild rect array from gap specs with new indices
         rect_memory = self._rectarray.ndarray()
 
@@ -777,7 +782,4 @@ class GapAnnotations(GraphicsObject):
             self._arrow_path.addPolygon(arrow_poly)
             self._arrow_path.closeSubpath()
 
-        # invalidate bounding rect cache
-        self._br = None
-        self.prepareGeometryChange()
         self.update()

piker/ui/_display.py

@@ -320,6 +320,41 @@ async def increment_history_view(
         profiler.finish()
 
 
+def _register_gap_overlays(
+    dss: dict[str, DisplayState],
+    godwidget: GodWidget,
+
+) -> GapOverlayMngr:
+    '''
+    Register display states and start local history gap overlays.
+
+    '''
+    from . import _remote_ctl
+
+    _remote_ctl._dss.update(dss)
+    gapman: GapOverlayMngr = _remote_ctl._gapman
+    godwidget.gapman = gapman
+    gap_timeframe: float = HIST_GAP_TIMEFRAME
+
+    # TODO: expose startup visibility and enabled timeframes through
+    # the UI config once chart periods are configurable.
+    fqme: str
+    ds: DisplayState
+    for fqme, ds in dss.items():
+        gap: GapOverlay = gapman.refresh(
+            ds=ds,
+            timeframe=gap_timeframe,
+        )
+        log.info(
+            'Chart-local gap overlay ready:\n'
+            f'fqme: {fqme}\n'
+            f'timeframe: {gap_timeframe}s\n'
+            f'gaps: {gap.gap_count}\n'
+        )
+
+    return gapman
+
+
 async def graphics_update_loop(
     dss: dict[str, DisplayState],
     nurse: trio.Nursery,
@@ -490,26 +525,9 @@ async def graphics_update_loop(
     # XXX TODO: we need to do _dss UPDATE here so that when
     # a feed-view is switched you can still remote annotate the
     # prior view..
-    from . import _remote_ctl
-    _remote_ctl._dss.update(dss)
-    gapman: GapOverlayMngr = _remote_ctl._gapman
-    godwidget.gapman = gapman
-    gap_timeframe: float = HIST_GAP_TIMEFRAME
-
-    # TODO: expose startup visibility and enabled timeframes through
-    # the UI config once chart periods are configurable.
-    fqme: str
-    ds: DisplayState
-    for fqme, ds in dss.items():
-        gap: GapOverlay = gapman.refresh(
-            ds=ds,
-            timeframe=gap_timeframe,
-        )
-        log.info(
-            'Chart-local gap overlay ready:\n'
-            f'fqme: {fqme}\n'
-            f'timeframe: {gap_timeframe}s\n'
-            f'gaps: {gap.gap_count}\n'
+    _register_gap_overlays(
+        dss=dss,
+        godwidget=godwidget,
     )
 
     # main real-time quotes update loop

piker/ui/_gaps.py

@@ -31,8 +31,10 @@ from piker.types import Struct
 from ._annotate import GapAnnotations
 
 if TYPE_CHECKING:
-    from piker.ui.qt import QGraphicsItem
     from PyQt6.QtWidgets import QGraphicsScene
+    from pyqtgraph import PlotItem
+
+    from piker.ui.qt import QGraphicsItem
     from ._chart import ChartPlotWidget
     from ._dataviz import Viz
     from ._display import DisplayState
@@ -226,6 +228,37 @@ class GapOverlayMngr:
             ],
             bool,  # `SetGapOverlay.visible`
         ] = {}
+        self._plots: dict[
+            int,  # `id(GapAnnotations)`
+            PlotItem,  # owning `Viz.plot`
+        ] = {}
+
+    def _remove_annot(
+        self,
+        aid: int,
+
+    ) -> None:
+        '''
+        Remove one gap item from all manager and plot registries.
+
+        '''
+        annot: QGraphicsItem|None = self.annots.pop(
+            aid,
+            None,
+        )
+        plot: PlotItem|None = self._plots.pop(aid, None)
+        if annot is None:
+            return
+
+        if plot is not None:
+            plot.removeItem(annot)
+            return
+
+        # Defensive fallback for manager state created before the
+        # owning `Viz.plot` registry was introduced.
+        scene: QGraphicsScene|None = annot.scene()
+        if scene:
+            scene.removeItem(annot)
 
     def apply(
         self,
@@ -277,16 +310,9 @@ class GapOverlayMngr:
         )
         aid: int|None = self._layers.pop(layer_key, None)
         if aid is not None:
-            annot: QGraphicsItem|None = self.annots.pop(
-                aid,
-                None,
-            )
             if aids is not None:
                 aids.discard(aid)
-            if annot is not None:
-                scene: QGraphicsScene|None = annot.scene()
-                if scene:
-                    scene.removeItem(annot)
+            self._remove_annot(aid)
 
         if owner == 'chart-local':
             self._visible[
@@ -318,11 +344,15 @@ class GapOverlayMngr:
             fqme=req.fqme,
             timeframe=req.timeframe,
         )
-        viz.plot.addItem(gaps_item)
+        viz.plot.addItem(
+            gaps_item,
+            ignoreBounds=True,
+        )
         gaps_item._chart = chart
 
         new_aid: int = id(gaps_item)
         self.annots[new_aid] = gaps_item
+        self._plots[new_aid] = viz.plot
         self._layers[layer_key] = new_aid
         if aids is not None:
             aids.add(new_aid)
@@ -403,11 +433,4 @@ class GapOverlayMngr:
         layer_key: tuple[str, int, str, float]
         for layer_key in owner_keys:
             aid: int = self._layers.pop(layer_key)
-            annot: QGraphicsItem|None = self.annots.pop(
-                aid,
-                None,
-            )
-            if annot is not None:
-                scene: QGraphicsScene|None = annot.scene()
-                if scene:
-                    scene.removeItem(annot)
+            self._remove_annot(aid)

piker/ui/_interaction.py

@@ -48,7 +48,6 @@ import trio
 
 from piker.ui.qt import (
     QWheelEvent,
-    QGraphicsSceneMouseEvent as gs_mouse,
     Qt,
     QEvent,
 )
@@ -108,6 +107,43 @@ ORDER_MODE = {
 }
 
 
+def _toggle_gap_overlays(
+    view: ChartView,
+    dss: dict[str, DisplayState],
+    gapman: GapOverlayMngr,
+
+) -> list[GapOverlay]:
+    '''
+    Toggle gap layers sharing the focused chart and timeframe.
+
+    '''
+    gaps: list[GapOverlay] = []
+    fqme: str
+    ds: DisplayState
+    for fqme, ds in dss.items():
+        if view._chart is ds.hist_chart:
+            timeframe: float = HIST_GAP_TIMEFRAME
+        elif view._chart is ds.chart:
+            timeframe = RT_GAP_TIMEFRAME
+        else:
+            continue
+
+        gap: GapOverlay = gapman.toggle(
+            ds=ds,
+            timeframe=timeframe,
+        )
+        gaps.append(gap)
+        log.info(
+            'Toggled chart-local gap overlay:\n'
+            f'fqme: {fqme}\n'
+            f'timeframe: {timeframe}s\n'
+            f'visible: {gap.visible}\n'
+            f'gaps: {gap.gap_count}\n'
+        )
+
+    return gaps
+
+
 async def handle_viewmode_kb_inputs(
 
     view: ChartView,
@@ -154,7 +190,7 @@ async def handle_viewmode_kb_inputs(
         shift: bool = False
 
         # press branch
-        if etype in {QEvent.KeyPress}:
+        if etype in {QEvent.Type.KeyPress}:
 
             pressed.add(key)
 
@@ -184,10 +220,10 @@ async def handle_viewmode_kb_inputs(
                 log.debug(f'fast keys seqs {fast_key_seq}')
 
             # mods run through
-            if mods == Qt.ShiftModifier:
+            if mods == Qt.KeyboardModifier.ShiftModifier:
                 shift = True
 
-            if mods == Qt.ControlModifier:
+            if mods == Qt.KeyboardModifier.ControlModifier:
                 ctrl = True
 
             # UI REPL-shell, with ctrl-p (for "pause")
@@ -195,7 +231,7 @@ async def handle_viewmode_kb_inputs(
                 ctrl
                 and
                 key in {
-                    Qt.Key_P,
+                    Qt.Key.Key_P,
                 }
             ):
                 feed = order_mode.feed  # noqa
@@ -213,7 +249,7 @@ async def handle_viewmode_kb_inputs(
                 ctrl
                 and
                 key in {
-                    Qt.Key_R,
+                    Qt.Key.Key_R,
                 }
             ):
                 fqme: str
@@ -236,29 +272,16 @@ async def handle_viewmode_kb_inputs(
             if (
                 ctrl
                 and
-                key == Qt.Key_G
+                key == Qt.Key.Key_G
             ):
                 gapman: GapOverlayMngr|None = godw.gapman
                 if gapman is not None:
-                    fqme: str
-                    ds: DisplayState
-                    for fqme, ds in dss.items():
-                        timeframe: float = (
-                            HIST_GAP_TIMEFRAME
-                            if view._chart is ds.hist_chart
-                            else RT_GAP_TIMEFRAME
-                        )
-                        gap: GapOverlay = gapman.toggle(
-                            ds=ds,
-                            timeframe=timeframe,
-                        )
-                        log.info(
-                            'Toggled chart-local gap overlay:\n'
-                            f'fqme: {fqme}\n'
-                            f'timeframe: {timeframe}s\n'
-                            f'visible: {gap.visible}\n'
-                            f'gaps: {gap.gap_count}\n'
+                    _toggle_gap_overlays(
+                        view=view,
+                        dss=dss,
+                        gapman=gapman,
                     )
+                continue
 
             # ------ - ------
             # SEARCH MODE
@@ -363,7 +386,7 @@ async def handle_viewmode_kb_inputs(
                     fast_key_seq.clear()
 
         # release branch
-        elif etype in {QEvent.KeyRelease}:
+        elif etype in {QEvent.Type.KeyRelease}:
 
             if on_next_release:
                 on_next_release()
@@ -675,8 +698,8 @@ class ChartView(ViewBox):
             _event.open_handlers(
                 [self],
                 event_types={
-                    QEvent.KeyPress,
-                    QEvent.KeyRelease,
+                    QEvent.Type.KeyPress,
+                    QEvent.Type.KeyRelease,
                 },
                 async_handler=partial(
                     handle_viewmode_kb_inputs,
@@ -686,7 +709,7 @@ class ChartView(ViewBox):
             _event.open_handlers(
                 [self],
                 event_types={
-                    gs_mouse.GraphicsSceneMousePress,
+                    QEvent.Type.GraphicsSceneMousePress,
                 },
                 async_handler=partial(
                     handle_viewmode_mouse,

plans/opencode/chart-local-gap-overlays.md

@@ -118,3 +118,10 @@ python -m ruff check piker/ui/_gaps.py \
 Manual chart qualification must confirm startup rendering, focused-timeframe
 `Ctrl+G`, remote typed replacement, remote disconnect cleanup, cached symbol
 switching and refresh after backfill repair.
+
+Automated integration coverage uses real offscreen Qt plots and a real
+Tractor child actor. It verifies manager insertion, replacement, hiding and
+owner cleanup; prepend repositioning; duplicate-FQME chart identity; startup
+registration; Qt Ctrl-G event routing; typed endpoint/client exchange; and
+cancellation with stale-reply recovery. A broker-backed qtractor session and
+history-revision-triggered refresh remain manual qualification boundaries.

plans/opencode/chart-local-gap-overlays.summary.md

@@ -19,7 +19,7 @@ Own gap overlays inside the chart actor
 
 - 10 production/test files changed
 - 2 architecture plan files added
-- 19 focused regressions passing
+- 25 focused regressions passing
 - 0 existing branches moved
 
 (this patch was generated in some part by

tests/test_gap_overlays.py

@@ -2,10 +2,29 @@
 Typed chart-local gap-overlay regressions.
 
 '''
+from collections.abc import (
+    Callable,
+    Iterator,
+)
+from contextlib import AsyncExitStack
+import os
+from types import SimpleNamespace
+
+os.environ['QT_QPA_PLATFORM'] = 'offscreen'
+
 import msgspec
 import numpy as np
+from PyQt6.QtGui import QKeyEvent
+from PyQt6.QtWidgets import QGraphicsScene
+import pyqtgraph as pg
 import pytest
+import tractor
+from tractor._testing import tractor_test
+import trio
+from trio.testing import wait_all_tasks_blocked
 
+from piker.ui._annotate import GapAnnotations
+from piker.ui._display import _register_gap_overlays
 from piker.ui._gaps import (
     GapOverlay,
     GapOverlayMngr,
@@ -14,6 +33,129 @@ from piker.ui._gaps import (
     SetGapOverlay,
     gap_specs_from_ohlcv,
 )
+from piker.ui._interaction import (
+    ChartView,
+    _toggle_gap_overlays,
+)
+from piker.ui.qt import (
+    QApplication,
+    QEvent,
+    QPointF,
+    QRectF,
+    Qt,
+    QWidget,
+)
+
+
+FQME: str = 'gap.test'
+
+
+class _ChartStub:
+    '''
+    Real Qt plot with the small chart API required by `gapman`.
+
+    '''
+    def __init__(
+        self,
+        fqme: str,
+        array: np.ndarray,
+
+    ) -> None:
+        self.fqme: str = fqme
+        self.widget: pg.PlotWidget = pg.PlotWidget()
+        self.viz: SimpleNamespace = SimpleNamespace(
+            plot=self.widget.plotItem,
+            shm=SimpleNamespace(array=array),
+        )
+
+    def get_viz(
+        self,
+        fqme: str,
+
+    ) -> SimpleNamespace:
+        '''
+        Return this chart's only viz.
+
+        '''
+        assert fqme == self.fqme
+        return self.viz
+
+    def close(self) -> None:
+        '''
+        Release this test-owned plot widget.
+
+        '''
+        self.widget.close()
+        self.widget.deleteLater()
+
+
+def _ohlcv_array(
+    times: tuple[float, ...],
+
+) -> np.ndarray:
+    '''
+    Build the minimal structured OHLCV used by gap rendering.
+
+    '''
+    dtype: np.dtype = np.dtype([
+        ('index', 'i8'),
+        ('time', 'f8'),
+        ('open', 'f8'),
+        ('close', 'f8'),
+    ])
+    rows: list[tuple[int, float, float, float]] = []
+    i: int
+    time_s: float
+    for i, time_s in enumerate(times):
+        price: float = 100 + i
+        rows.append((i, time_s, price, price + 0.5))
+
+    return np.array(rows, dtype=dtype)
+
+
+def _display_state(
+    fqme: str,
+
+) -> tuple[
+    SimpleNamespace,
+    tuple[_ChartStub, _ChartStub],
+]:
+    '''
+    Build independent realtime and history chart stubs.
+
+    '''
+    rt_chart: _ChartStub = _ChartStub(
+        fqme,
+        _ohlcv_array((1, 2, 4, 5)),
+    )
+    hist_chart: _ChartStub = _ChartStub(
+        fqme,
+        _ohlcv_array((60, 120, 300, 360)),
+    )
+    ds: SimpleNamespace = SimpleNamespace(
+        fqme=fqme,
+        chart=rt_chart,
+        viz=rt_chart.viz,
+        hist_chart=hist_chart,
+        hist_viz=hist_chart.viz,
+    )
+    return ds, (rt_chart, hist_chart)
+
+
+@pytest.fixture(scope='session')
+def qapp() -> Iterator[QApplication]:
+    '''
+    Keep one offscreen Qt application alive for graphics tests.
+
+    '''
+    app: QApplication|None = QApplication.instance()
+    if app is None:
+        app = QApplication(['piker-gap-tests'])
+    app.setQuitOnLastWindowClosed(False)
+
+    yield app
+
+    app.processEvents()
 
 
 def test_gap_specs_and_wire_roundtrip() -> None:
@@ -146,3 +288,738 @@ def test_gap_overlay_unknown_fqme_returns_typed_error() -> None:
 
     assert resp.request_id == req.request_id
     assert resp.error == 'No display state for fqme=gone.test'
+
+
+def test_gap_manager_real_qt_lifecycle(
+    qapp: QApplication,
+
+) -> None:
+    '''
+    Remove overlays from every PyQtGraph registry.
+
+    Gap layers are inserted through `PlotItem.addItem()`. Removing
+    the item directly from its scene leaves stale `PlotItem.items`
+    and `ViewBox.addedItems` refs which can leak memory and affect
+    range calculations. This test uses real offscreen Qt plots,
+    replaces one remotely owned layer, hides it, and proves each
+    registry releases the old graphics object.
+
+    '''
+    ds: SimpleNamespace
+    charts: tuple[_ChartStub, _ChartStub]
+    ds, charts = _display_state(FQME)
+    annots: dict[int, GapAnnotations] = {}
+    gapman: GapOverlayMngr = GapOverlayMngr(
+        dss={FQME: ds},
+        annots=annots,
+    )
+    specs: list[GapSpec] = gap_specs_from_ohlcv(
+        ds.hist_viz.shm.array,
+        period_s=60,
+    )
+    aids: set[int] = set()
+    req: SetGapOverlay = SetGapOverlay(
+        fqme=FQME,
+        timeframe=60,
+        specs=specs,
+        request_id='first',
+    )
+
+    try:
+        first: GapOverlay = gapman.apply(
+            req=req,
+            owner='remote-test',
+            aids=aids,
+        )
+        assert first.aid is not None
+        first_item: GapAnnotations = annots[first.aid]
+        assert first_item.scene() is charts[1].widget.scene()
+        assert first_item in ds.hist_viz.plot.items
+        assert first_item not in ds.hist_viz.plot.vb.addedItems
+        assert aids == {first.aid}
+
+        second: GapOverlay = gapman.apply(
+            req=SetGapOverlay(
+                fqme=FQME,
+                timeframe=60,
+                specs=specs,
+                request_id='second',
+            ),
+            owner='remote-test',
+            aids=aids,
+        )
+        assert second.aid is not None
+        assert second.aid != first.aid
+        assert first.aid not in annots
+        assert first_item.scene() is None
+        assert first_item not in ds.hist_viz.plot.items
+        assert first_item not in ds.hist_viz.plot.vb.addedItems
+        assert aids == {second.aid}
+
+        hidden: GapOverlay = gapman.apply(
+            req=SetGapOverlay(
+                fqme=FQME,
+                timeframe=60,
+                specs=specs,
+                visible=False,
+                request_id='hidden',
+            ),
+            owner='remote-test',
+            aids=aids,
+        )
+        assert hidden.visible is False
+        assert hidden.aid is None
+        assert aids == set()
+        assert annots == {}
+        assert gapman._layers == {}
+        assert gapman._plots == {}
+        item: object
+        for item in ds.hist_viz.plot.items:
+            assert not isinstance(item, GapAnnotations)
+
+        local: GapOverlay = gapman.apply(
+            req=SetGapOverlay(
+                fqme=FQME,
+                timeframe=60,
+                specs=specs,
+                request_id='local',
+            ),
+        )
+        remote: GapOverlay = gapman.apply(
+            req=SetGapOverlay(
+                fqme=FQME,
+                timeframe=60,
+                specs=specs,
+                request_id='remote',
+            ),
+            owner='remote-test',
+        )
+        assert local.aid is not None
+        assert remote.aid is not None
+        gapman.remove_owner('remote-test')
+        assert local.aid in annots
+        assert remote.aid not in annots
+        assert annots[local.aid].scene() is not None
+        gapman.remove_owner('chart-local')
+        assert annots == {}
+    finally:
+        chart: _ChartStub
+        for chart in charts:
+            chart.close()
+        qapp.processEvents()
+
+
+def test_gap_annotations_reposition_after_prepend(
+    qapp: QApplication,
+
+) -> None:
+    '''
+    Reposition live gap geometry after history index offsets change.
+
+    A history prepend preserves timestamps but shifts every absolute
+    chart index. Gap rectangles and arrows otherwise remain attached
+    to their pre-prepend x coordinates. Render one real gap item,
+    shift its source indexes by ten, call `reposition()`, and prove
+    its rectangle bounds and arrow spec move together while the item
+    stays attached to its real Qt scene.
+
+    '''
+    ds: SimpleNamespace
+    charts: tuple[_ChartStub, _ChartStub]
+    ds, charts = _display_state(FQME)
+    annots: dict[int, GapAnnotations] = {}
+    gapman: GapOverlayMngr = GapOverlayMngr(
+        dss={FQME: ds},
+        annots=annots,
+    )
+
+    try:
+        gap: GapOverlay = gapman.refresh(
+            ds=ds,
+            timeframe=60,
+        )
+        assert gap.aid is not None
+        item: GapAnnotations = annots[gap.aid]
+        old_br: QRectF = item.boundingRect()
+        scene: QGraphicsScene = charts[1].widget.scene()
+        old_scene_point: QPointF = item.mapToScene(
+            old_br.center()
+        )
+        qapp.processEvents()
+        assert item in scene.items(old_scene_point)
+        old_rects: np.ndarray = (
+            item._rectarray.ndarray().copy()
+        )
+        shifted: np.ndarray = ds.hist_viz.shm.array.copy()
+        shifted['index'] += 10
+
+        item.reposition(
+            array=shifted,
+            fqme=FQME,
+            timeframe=60,
+        )
+        qapp.processEvents()
+
+        new_rects: np.ndarray = item._rectarray.ndarray()
+        np.testing.assert_allclose(
+            new_rects[:, 0],
+            old_rects[:, 0] + 10,
+        )
+        assert item._gap_specs[0]['arrow_x'] == 12
+        new_br: QRectF = item.boundingRect()
+        new_scene_point: QPointF = item.mapToScene(
+            new_br.center()
+        )
+        assert new_br.left() == old_br.left() + 10
+        assert item in scene.items(new_scene_point)
+        assert item not in scene.items(old_scene_point)
+        assert item.scene() is charts[1].widget.scene()
+    finally:
+        gapman.remove_owner('chart-local')
+        chart: _ChartStub
+        for chart in charts:
+            chart.close()
+        qapp.processEvents()
+
+
+def test_duplicate_fqme_layers_use_local_chart_identity(
+    qapp: QApplication,
+
+) -> None:
+    '''
+    Keep cached displays for one FQME in separate local layers.
+
+    The actor-global display lookup is keyed by FQME and can
+    represent only its currently registered display. Local cached
+    charts still pass their exact `DisplayState` into
+    `GapOverlayMngr.refresh()`. Build two independent chart pairs
+    with the same FQME, refresh both, and prove their layers survive
+    independently.
+
+    '''
+    first_ds: SimpleNamespace
+    first_charts: tuple[_ChartStub, _ChartStub]
+    first_ds, first_charts = _display_state(FQME)
+    second_ds: SimpleNamespace
+    second_charts: tuple[_ChartStub, _ChartStub]
+    second_ds, second_charts = _display_state(FQME)
+    annots: dict[int, GapAnnotations] = {}
+    gapman: GapOverlayMngr = GapOverlayMngr(
+        dss={FQME: second_ds},
+        annots=annots,
+    )
+
+    try:
+        first: GapOverlay = gapman.refresh(
+            ds=first_ds,
+            timeframe=60,
+        )
+        second: GapOverlay = gapman.refresh(
+            ds=second_ds,
+            timeframe=60,
+        )
+        assert first.aid is not None
+        assert second.aid is not None
+        assert first.aid != second.aid
+        assert len(gapman._layers) == 2
+        chart_ids: set[int] = set()
+        key: tuple[str, int, str, float]
+        for key in gapman._layers:
+            chart_ids.add(key[1])
+        assert chart_ids == {
+            id(first_ds.hist_chart),
+            id(second_ds.hist_chart),
+        }
+        assert annots[first.aid].scene() is not None
+        assert annots[second.aid].scene() is not None
+    finally:
+        gapman.remove_owner('chart-local')
+        chart: _ChartStub
+        for chart in (*first_charts, *second_charts):
+            chart.close()
+        qapp.processEvents()
+
+
+def test_startup_and_focused_toggle_use_real_qt(
+    qapp: QApplication,
+    monkeypatch: pytest.MonkeyPatch,
+
+) -> None:
+    '''
+    Register history gaps and toggle the focused chart only.
+
+    Startup previously lived inside the quote loop and keyboard
+    routing treated every state unrelated to the focused history
+    chart as a realtime target. Two independent chart pairs reproduce
+    that skew. The startup helper must create only 60-second layers;
+    then a focused history toggle must hide only its own layer while
+    leaving the other cached chart's overlay intact.
+
+    '''
+    from piker.ui import _remote_ctl
+
+    first_ds: SimpleNamespace
+    first_charts: tuple[_ChartStub, _ChartStub]
+    first_ds, first_charts = _display_state('first.test')
+    second_ds: SimpleNamespace
+    second_charts: tuple[_ChartStub, _ChartStub]
+    second_ds, second_charts = _display_state('second.test')
+    dss: dict[str, SimpleNamespace] = {
+        first_ds.fqme: first_ds,
+        second_ds.fqme: second_ds,
+    }
+    annots: dict[int, GapAnnotations] = {}
+    gapman: GapOverlayMngr = GapOverlayMngr(
+        dss={},
+        annots=annots,
+    )
+    remote_dss: dict[str, SimpleNamespace] = {}
+    monkeypatch.setattr(_remote_ctl, '_dss', remote_dss)
+    monkeypatch.setattr(_remote_ctl, '_annots', annots)
+    monkeypatch.setattr(_remote_ctl, '_gapman', gapman)
+    godwidget: SimpleNamespace = SimpleNamespace(gapman=None)
+
+    try:
+        started: GapOverlayMngr = _register_gap_overlays(
+            dss=dss,
+            godwidget=godwidget,
+        )
+        assert started is gapman
+        assert godwidget.gapman is gapman
+        assert remote_dss == dss
+        assert len(gapman._layers) == 2
+        key: tuple[str, int, str, float]
+        for key in gapman._layers:
+            assert key[3] == 60
+
+        view: SimpleNamespace = SimpleNamespace(
+            _chart=first_ds.hist_chart,
+        )
+        toggled: list[GapOverlay] = _toggle_gap_overlays(
+            view=view,
+            dss=dss,
+            gapman=gapman,
+        )
+        assert len(toggled) == 1
+        assert toggled[0].fqme == first_ds.fqme
+        assert toggled[0].timeframe == 60
+        assert toggled[0].visible is False
+        assert (
+            'chart-local',
+            id(first_ds.hist_chart),
+            first_ds.fqme,
+            60,
+        ) not in gapman._layers
+        assert (
+            'chart-local',
+            id(second_ds.hist_chart),
+            second_ds.fqme,
+            60,
+        ) in gapman._layers
+
+        view._chart = first_ds.chart
+        rt_toggled: list[GapOverlay] = _toggle_gap_overlays(
+            view=view,
+            dss=dss,
+            gapman=gapman,
+        )
+        assert len(rt_toggled) == 1
+        assert rt_toggled[0].fqme == first_ds.fqme
+        assert rt_toggled[0].timeframe == 1
+        assert rt_toggled[0].visible is True
+        assert (
+            'chart-local',
+            id(first_ds.chart),
+            first_ds.fqme,
+            1,
+        ) in gapman._layers
+
+        unrelated: list[GapOverlay] = _toggle_gap_overlays(
+            view=SimpleNamespace(_chart=object()),
+            dss=dss,
+            gapman=gapman,
+        )
+        assert unrelated == []
+    finally:
+        gapman.remove_owner('chart-local')
+        chart: _ChartStub
+        for chart in (*first_charts, *second_charts):
+            chart.close()
+        qapp.processEvents()
+
+
+def test_ctrl_g_event_renders_real_history_overlay(
+    qapp: QApplication,
+
+) -> None:
+    '''
+    Route a real Qt Ctrl-G event into a rendered history gap layer.
+
+    Calling the toggle helper directly does not prove that Qt event
+    filtering, `KeyboardMsg` conversion or the asynchronous view-mode
+    handler recognizes the configured binding. Install the production
+    `EventRelay` on a real widget, send one offscreen `QKeyEvent`,
+    and wait until the handler blocks again. The resulting manager
+    and scene state prove the complete local keyboard path ran.
+
+    '''
+    ds: SimpleNamespace
+    charts: tuple[_ChartStub, _ChartStub]
+    ds, charts = _display_state(FQME)
+    annots: dict[int, GapAnnotations] = {}
+    gapman: GapOverlayMngr = GapOverlayMngr(
+        dss={FQME: ds},
+        annots=annots,
+    )
+    nav: SimpleNamespace = SimpleNamespace(
+        hide_info=lambda: None,
+    )
+    lines: SimpleNamespace = SimpleNamespace(
+        unstage_line=lambda: None,
+    )
+    godwidget: SimpleNamespace = SimpleNamespace(gapman=gapman)
+    order_mode: SimpleNamespace = SimpleNamespace(
+        godw=godwidget,
+        cancel_all_orders=lambda: None,
+        current_pp=SimpleNamespace(nav=nav),
+        lines=lines,
+        active=False,
+    )
+    source: QWidget = QWidget()
+    source.order_mode = order_mode
+    source._chart = ds.hist_chart
+    source.linked = SimpleNamespace(
+        cursor=SimpleNamespace(in_query_mode=False),
+    )
+    source.setMouseMode = lambda mode: None
+
+    async def drive_key_event() -> None:
+        '''
+        Run the production input context around one key event.
+
+        '''
+        async with ChartView.open_async_input_handler(
+            source,
+            dss={FQME: ds},
+        ):
+            key_event: QKeyEvent = QKeyEvent(
+                QEvent.Type.KeyPress,
+                Qt.Key.Key_G,
+                Qt.KeyboardModifier.ControlModifier,
+                'g',
+            )
+            assert QApplication.sendEvent(source, key_event)
+            await wait_all_tasks_blocked()
+
+    try:
+        trio.run(drive_key_event)
+        assert len(gapman._layers) == 1
+        layer_key: tuple[str, int, str, float] = next(
+            iter(gapman._layers)
+        )
+        assert layer_key == (
+            'chart-local',
+            id(ds.hist_chart),
+            FQME,
+            60,
+        )
+        aid: int = gapman._layers[layer_key]
+        assert annots[aid].scene() is charts[1].widget.scene()
+    finally:
+        gapman.remove_owner('chart-local')
+        source.close()
+        source.deleteLater()
+        chart: _ChartStub
+        for chart in charts:
+            chart.close()
+        qapp.processEvents()
+
+
+_actor_requests: list[dict] = []
+_actor_removed: list[str] = []
+_delayed_request_ids: list[str] = []
+
+
+class _ActorGapMngr:
+    '''
+    Minimal child-actor manager used around the real endpoint.
+
+    '''
+
+    def apply(
+        self,
+        req: SetGapOverlay,
+        owner: str,
+        aids: set[int],
+        ds: object|None = None,
+
+    ) -> GapOverlay:
+        '''
+        Record a typed request and return its correlated state.
+
+        '''
+        aid: int = 616
+        aids.add(aid)
+        _actor_requests.append({
+            'fqme': req.fqme,
+            'timeframe': req.timeframe,
+            'request_id': req.request_id,
+            'owner': owner,
+        })
+        return GapOverlay(
+            fqme=req.fqme,
+            timeframe=req.timeframe,
+            visible=req.visible,
+            gap_count=len(req.specs),
+            aid=aid,
+            request_id=req.request_id,
+        )
+
+    def remove_owner(
+        self,
+        owner: str,
+
+    ) -> None:
+        '''
+        Record endpoint-finally cleanup in the child actor.
+
+        '''
+        _actor_removed.append(owner)
+
+
+async def _init_gap_actor() -> None:
+    '''
+    Install isolated endpoint globals inside the child actor.
+
+    '''
+    from piker.ui import _remote_ctl
+
+    _actor_requests.clear()
+    _actor_removed.clear()
+    _delayed_request_ids.clear()
+    _remote_ctl._dss.clear()
+    _remote_ctl._dss[FQME] = object()
+    _remote_ctl._gapman = _ActorGapMngr()
+
+
+async def _gap_actor_snapshot() -> dict:
+    '''
+    Return serializable endpoint evidence from the child actor.
+
+    '''
+    return {
+        'requests': list(_actor_requests),
+        'removed': list(_actor_removed),
+        'delayed_request_ids': list(_delayed_request_ids),
+    }
+
+
+@tractor.context(pld_spec=GapOverlayPayload)
+async def _delayed_gap_dialog(
+    ctx: tractor.Context,
+
+) -> None:
+    '''
+    Delay the first reply so client cancellation leaves it queued.
+
+    '''
+    await ctx.started([FQME])
+    stream: tractor.MsgStream
+    async with ctx.open_stream() as stream:
+        with ctx.pld_rx.limit_plds(spec=SetGapOverlay):
+            req_count: int = 0
+            req: SetGapOverlay
+            async for req in stream:
+                req_count += 1
+                _delayed_request_ids.append(req.request_id)
+                if req_count == 1:
+                    await stream.send(GapOverlay(
+                        fqme=req.fqme,
+                        timeframe=req.timeframe,
+                        visible=req.visible,
+                        gap_count=0,
+                        request_id='actor-received',
+                    ))
+                    await trio.sleep(0.05)
+
+                await stream.send(GapOverlay(
+                    fqme=req.fqme,
+                    timeframe=req.timeframe,
+                    visible=req.visible,
+                    gap_count=len(req.specs),
+                    request_id=req.request_id,
+                ))
+
+
+@tractor_test(timeout=20)
+async def test_remote_gap_dialog_real_actor(
+    monkeypatch: pytest.MonkeyPatch,
+
+) -> None:
+    '''
+    Exchange typed gap state through the production Tractor endpoint.
+
+    Schema-only tests can pass while endpoint discovery, directional
+    decoding, stream setup, request correlation or context-finally
+    cleanup is broken. Boot a real child actor, initialize only its
+    actor-local display and manager globals, call the production
+    `remote_gap_overlays()` context through `AnnotClient`, and verify
+    the child receives the generated request ID and removes its owner
+    after stream closure.
+
+    A second child context emits a receipt before delaying the first
+    reply. Cancel that exact client task after the receipt, submit a
+    second request on the shared stream, and prove the client
+    discards the queued first reply before returning the second. The
+    child-side request IDs prove cancellation happened after
+    publication instead of merely preventing the first send.
+
+    '''
+    from piker.ui._remote_ctl import (
+        AnnotClient,
+        remote_gap_overlays,
+    )
+    from piker.ui import _remote_ctl
+
+    receipt_seen: trio.Event = trio.Event()
+    original_warning: Callable[..., None] = (
+        _remote_ctl.log.warning
+    )
+
+    def observe_warning(
+        msg: str,
+        *args: object,
+        **kwargs: object,
+
+    ) -> None:
+        '''
+        Observe the stale receipt before cancelling its client task.
+
+        '''
+        if 'actor-received' in msg:
+            receipt_seen.set()
+        original_warning(msg, *args, **kwargs)
+
+    monkeypatch.setattr(
+        _remote_ctl.log,
+        'warning',
+        observe_warning,
+    )
+
+    actor_nursery: tractor.ActorNursery
+    async with tractor.open_nursery() as actor_nursery:
+        portal: tractor.Portal = await actor_nursery.start_actor(
+            'gap-overlay-test-server',
+            enable_modules=[
+                __name__,
+                'piker.ui._remote_ctl',
+            ],
+        )
+        try:
+            await portal.run(_init_gap_actor)
+            ctx: tractor.Context
+            fqmes: list[str]
+            async with portal.open_context(
+                remote_gap_overlays,
+            ) as (ctx, fqmes):
+                assert fqmes == [FQME]
+
+                stream: tractor.MsgStream
+                async with ctx.open_stream() as stream:
+                    client: AnnotClient = AnnotClient(
+                        ctx2fqmes={ctx.cid: {FQME}},
+                        fqme2ipc={},
+                        fqme2gap_ipc={FQME: stream},
+                        _gap_locks={FQME: trio.Lock()},
+                        _annot_stack=AsyncExitStack(),
+                        _ipcs={},
+                    )
+                    supplied_id: str = 'client-id-is-replaced'
+                    gap: GapOverlay = await client.set_gap_overlay(
+                        SetGapOverlay(
+                            fqme=FQME,
+                            timeframe=60,
+                            specs=[],
+                            request_id=supplied_id,
+                        )
+                    )
+                    assert gap.aid == 616
+                    assert gap.request_id != supplied_id
+
+            snapshot: dict = await portal.run(
+                _gap_actor_snapshot,
+            )
+            requests: list[dict] = snapshot['requests']
+            assert len(requests) == 1
+            assert requests[0]['request_id'] == gap.request_id
+            assert snapshot['removed'] == [requests[0]['owner']]
+
+            delayed_ctx: tractor.Context
+            delayed_fqmes: list[str]
+            async with portal.open_context(
+                _delayed_gap_dialog,
+            ) as (delayed_ctx, delayed_fqmes):
+                assert delayed_fqmes == [FQME]
+
+                delayed_stream: tractor.MsgStream
+                async with (
+                    delayed_ctx.open_stream() as delayed_stream,
+                ):
+                    delayed_client: AnnotClient = AnnotClient(
+                        ctx2fqmes={delayed_ctx.cid: {FQME}},
+                        fqme2ipc={},
+                        fqme2gap_ipc={FQME: delayed_stream},
+                        _gap_locks={FQME: trio.Lock()},
+                        _annot_stack=AsyncExitStack(),
+                        _ipcs={},
+                    )
+                    first_scope: trio.CancelScope = (
+                        trio.CancelScope()
+                    )
+
+                    async def cancel_first_request() -> None:
+                        '''
+                        Wait for cancellation inside the first
+                        dialog.
+
+                        '''
+                        with first_scope:
+                            await delayed_client.set_gap_overlay(
+                                SetGapOverlay(
+                                    fqme=FQME,
+                                    timeframe=60,
+                                    specs=[],
+                                )
+                            )
+
+                    nursery: trio.Nursery
+                    async with trio.open_nursery() as nursery:
+                        nursery.start_soon(cancel_first_request)
+                        await receipt_seen.wait()
+                        first_scope.cancel()
+                        await wait_all_tasks_blocked()
+
+                        recovered: GapOverlay = (
+                            await delayed_client.set_gap_overlay(
+                                SetGapOverlay(
+                                    fqme=FQME,
+                                    timeframe=60,
+                                    specs=[],
+                                )
+                            )
+                        )
+                        assert recovered.fqme == FQME
+                        assert recovered.request_id
+                        nursery.cancel_scope.cancel()
+
+            delayed_snapshot: dict = await portal.run(
+                _gap_actor_snapshot,
+            )
+            delayed_ids: list[str] = (
+                delayed_snapshot['delayed_request_ids']
+            )
+            assert len(delayed_ids) == 2
+            assert delayed_ids[0] != delayed_ids[1]
+            assert delayed_ids[1] == recovered.request_id
+        finally:
+            await portal.cancel_actor()