Drop `.group_maxmin()`

We ended up doing groups maxmin sorting at the interaction layer (new
the view box) and thus this method is no longer needed, though it was
the reference for the code now in `ChartView.interact_graphics_cycle()`.

Further this adds a `remove_axes: bool` arg to `.insert_plotitem()`
which can be used to drop axis entries from the inserted pi (though it
doesn't seem like we really ever need that?) and does the removal in
a separate loop to avoid removing axes before they are registered in
`ComposedGridLayout._pi2axes`.

piker/ui/_overlay.py

@@ -115,6 +115,7 @@ class ComposedGridLayout:
 
             layout.setContentsMargins(0, 0, 0, 0)
             layout.setSpacing(0)
+            layout.setMinimumWidth(0)
 
             if name in ('top', 'bottom'):
                 orient = Qt.Vertical
@@ -124,7 +125,11 @@ class ComposedGridLayout:
 
             layout.setOrientation(orient)
 
-        self.insert_plotitem(0, pi)
+        self.insert_plotitem(
+            0,
+            pi,
+            remove_axes=False,
+        )
 
         # insert surrounding linear layouts into the parent pi's layout
         # such that additional axes can be appended arbitrarily without
@@ -139,7 +144,9 @@ class ComposedGridLayout:
                 assert linlayout.itemAt(0) is axis
 
             # XXX: see comment in ``.insert_plotitem()``...
+            # our `PlotItem.removeAxis()` does this internally.
             # pi.layout.removeItem(axis)
+
             pi.layout.addItem(linlayout, *index)
             layout = pi.layout.itemAt(*index)
             assert layout is linlayout
@@ -164,6 +171,8 @@ class ComposedGridLayout:
         index: int,
         plotitem: PlotItem,
 
+        remove_axes: bool = False,
+
     ) -> tuple[int, list[AxisItem]]:
         '''
         Place item at index by inserting all axes into the grid
@@ -205,13 +214,6 @@ class ComposedGridLayout:
             ):
                 continue
 
-            # XXX: Remove old axis?
-            # No, turns out we don't need this?
-            # DON'T UNLINK IT since we need the original ``ViewBox`` to
-            # still drive it with events/handlers B)
-            # popped = plotitem.removeAxis(name, unlink=False)
-            # assert axis is popped
-
             # invert insert index for layouts which are
             # not-left-to-right, top-to-bottom insert oriented
             insert_index = index
@@ -224,6 +226,16 @@ class ComposedGridLayout:
 
         self._register_item(index, plotitem)
 
+        if remove_axes:
+            for name, axis_info in plotitem.axes.copy().items():
+                axis = axis_info['item']
+                # XXX: Remove old axis?
+                # No, turns out we don't need this?
+                # DON'T UNLINK IT since we need the original ``ViewBox`` to
+                # still drive it with events/handlers B)
+                popped = plotitem.removeAxis(name, unlink=False)
+                assert axis is popped
+
         return (index, inserted_axes)
 
     def append_plotitem(
@@ -577,93 +589,3 @@ class PlotItemOverlay:
 
     #     '''
     #     ...
-
-    def group_maxmin(
-        self,
-        focus_around: str | None = None,
-        force_min: float | None = None,
-
-    ) -> tuple[
-        float,  # mn
-        float,  # mx
-        float,  # max range in % terms of highest sigma plot's y-range
-        PlotItem,  # front/selected plot
-    ]:
-        '''
-        Overlay "group" maxmin sorting.
-
-        Assumes all named flows are in the same co-domain and thus can
-        be sorted as one set.
-
-        Iterates all the named flows and calls the chart api to find
-        their range values and return.
-
-        TODO: really we should probably have a more built-in API for
-        this?
-
-        '''
-        # TODO:
-        # - use this in the ``.ui._fsp`` mutli-maxmin stuff
-        # -
-
-        # force 0 to always be in view
-        group_mx: float = 0
-        group_mn: float = 0
-        mx_up_rng: float = 0
-        mn_down_rng: float = 0
-        pis2ranges: dict[
-            PlotItem,
-            tuple[float, float],
-        ] = {}
-
-        for pi in self.overlays:
-
-            # TODO: can we remove this from the widget
-            # and place somewhere more related to UX/Viz?
-            # name = pi.name
-            # chartw = pi.chart_widget
-            viz = pi.viz
-            # viz = chartw._vizs[name]
-
-            out = viz.maxmin()
-            if out is None:
-                return None
-
-            (
-                (x_start, x_stop),
-                read_slc,
-                (ymn, ymx),
-            ) = out
-
-            arr = viz.shm.array
-
-            y_start = arr[read_slc.start - 1]
-            y_stop = arr[read_slc.stop - 1]
-            if viz.is_ohlc:
-                y_start = y_start['open']
-                y_stop = y_stop['close']
-            else:
-                y_start = y_start[viz.name]
-                y_stop = y_stop[viz.name]
-
-            # update max for group
-            up_rng = (ymx - y_start) / y_start
-            down_rng = (y_stop - ymn) / y_stop
-
-            # compute directional (up/down) y-range % swing/dispersion
-            mx_up_rng = max(mx_up_rng, up_rng)
-            mn_down_rng = min(mn_down_rng, down_rng)
-
-            pis2ranges[pi] = (ymn, ymx)
-
-            group_mx = max(group_mx, ymx)
-            if force_min is None:
-                group_mn = min(group_mn, ymn)
-
-        return (
-           group_mn if force_min is None else force_min,
-           group_mx,
-           mn_down_rng,
-           mx_up_rng,
-           pis2ranges,
-        )