ui.order_mode: prioritize mkt-match on `.bs_mktid`

For backends which opt to set the new `BrokerdPosition.bs_mktid` field,
give (matching logic) priority to it such that even if the `.symbol`
field doesn't match the mkt currently focussed on chart, it will
always match on a provider's own internal asset-mapping-id. The original
fallback logic for `.fqme` matching is left as is.

As an example with IB, a qqq.nasdaq.ib txn may have been filled on
a non-primary venue as qqq.directedea.ib, in this case if the mkt is
displayed and focused on chart we want the **entire position info** to
be overlayed by the `OrderMode` UX without discrepancy.

Other refinements,
- improve logging and add a detailed edge-case-comment around the
  `.on_fill()` handler to clarify where if a benign 'error' msg is
  relayed from a backend it will cause the UI to operate as though the
  order **was not-cleared/cancelled** since the `.on_cancel()` handler
  will have likely been called just before, popping the `.dialogs`
  entry. Return `bool` to indicate whether the UI removed-lines
  / added-fill-arrows.
- inverse the `return` branching logic in `.on_cancel()` to reduce
  indent.
- add a very loud `log.error()` in `Status(resp='error')` case-block
  ensuring the console yells about the order being cancelled, also
  a todo for the weird msg-field recursion nonsense..

piker/ui/order_mode.py

@@ -555,14 +555,13 @@ class OrderMode:
 
     def on_fill(
         self,
-
         uuid: str,
         price: float,
         time_s: float,
 
         pointing: str | None = None,
 
-    ) -> None:
+    ) -> bool:
         '''
         Fill msg handler.
 
@@ -575,60 +574,83 @@ class OrderMode:
         - update fill bar size
 
         '''
-        dialog = self.dialogs[uuid]
+        # XXX WARNING XXX
+        # if a `Status(resp='error')` arrives *before* this
+        # fill-status, the `.dialogs` entry may have already been
+        # popped and thus the below will skipped.
+        #
+        # NOTE, to avoid this confusing scenario ensure that any
+        # errors delivered thru from the broker-backend are not just
+        # "noisy reporting" (like is very common from IB..) and are
+        # instead ONLY errors-causing-order-dialog-cancellation!
+        if not (dialog := self.dialogs.get(uuid)):
+            log.warning(
+                f'Order was already cleared from `.dialogs` ??\n'
+                f'uuid: {uuid!r}\n'
+            )
+            return False
+
         lines = dialog.lines
         chart = self.chart
 
-        # XXX: seems to fail on certain types of races?
+        if not lines:
-        # assert len(lines) == 2
-        if lines:
-            flume: Flume = self.feed.flumes[chart.linked.mkt.fqme]
-            _, _, ratio = flume.get_ds_info()
-
-            for chart, shm in [
-                (self.chart, flume.rt_shm),
-                (self.hist_chart, flume.hist_shm),
-            ]:
-                viz = chart.get_viz(chart.name)
-                index_field = viz.index_field
-                arr = shm.array
-
-                # TODO: borked for int index based..
-                index = flume.get_index(time_s, arr)
-
-                # get absolute index for arrow placement
-                arrow_index = arr[index_field][index]
-
-                self.arrows.add(
-                    chart.plotItem,
-                    uuid,
-                    arrow_index,
-                    price,
-                    pointing=pointing,
-                    color=lines[0].color
-                )
-        else:
             log.warn("No line(s) for order {uuid}!?")
+            return False
+
+        # update line state(s)
+        #
+        # ?XXX this fails on certain types of races?
+        # assert len(lines) == 2
+        flume: Flume = self.feed.flumes[chart.linked.mkt.fqme]
+        _, _, ratio = flume.get_ds_info()
+
+        for chart, shm in [
+            (self.chart, flume.rt_shm),
+            (self.hist_chart, flume.hist_shm),
+        ]:
+            viz = chart.get_viz(chart.name)
+            index_field = viz.index_field
+            arr = shm.array
+
+            # TODO: borked for int index based..
+            index = flume.get_index(time_s, arr)
+
+            # get absolute index for arrow placement
+            arrow_index = arr[index_field][index]
+
+            self.arrows.add(
+                chart.plotItem,
+                uuid,
+                arrow_index,
+                price,
+                pointing=pointing,
+                color=lines[0].color
+            )
 
     def on_cancel(
         self,
-        uuid: str
+        uuid: str,
 
-    ) -> None:
+    ) -> bool:
 
-        msg: Order = self.client._sent_orders.pop(uuid, None)
+        msg: Order|None = self.client._sent_orders.pop(uuid, None)
-
+        if msg is None:
-        if msg is not None:
-            self.lines.remove_line(uuid=uuid)
-            self.chart.linked.cursor.show_xhair()
-
-            dialog = self.dialogs.pop(uuid, None)
-            if dialog:
-                dialog.last_status_close()
-        else:
             log.warning(
                 f'Received cancel for unsubmitted order {pformat(msg)}'
             )
+            return False
+
+        # remove GUI line, show cursor.
+        self.lines.remove_line(uuid=uuid)
+        self.chart.linked.cursor.show_xhair()
+
+        # remove msg dialog (history)
+        dialog: Dialog|None = self.dialogs.pop(uuid, None)
+        if dialog:
+            dialog.last_status_close()
+
+        return True
+
 
     def cancel_orders_under_cursor(self) -> list[str]:
         return self.cancel_orders(
@@ -1057,13 +1079,23 @@ async def process_trade_msg(
     if name in (
         'position',
     ):
-        sym: MktPair = mode.chart.linked.mkt
+        mkt: MktPair = mode.chart.linked.mkt
         pp_msg_symbol = msg['symbol'].lower()
-        fqme = sym.fqme
+        pp_msg_bsmktid = msg['bs_mktid']
-        broker = sym.broker
+        fqme = mkt.fqme
+        broker = mkt.broker
         if (
+            # match on any backed-specific(-unique)-ID first!
+            (
+                pp_msg_bsmktid
+                and
+                mkt.bs_mktid == pp_msg_bsmktid
+            )
+            or
+            # OW try against what's provided as an FQME..
             pp_msg_symbol == fqme
-            or pp_msg_symbol == fqme.removesuffix(f'.{broker}')
+            or
+            pp_msg_symbol == fqme.removesuffix(f'.{broker}')
         ):
             log.info(
                 f'Loading position for `{fqme}`:\n'
@@ -1086,7 +1118,7 @@ async def process_trade_msg(
         return
 
     msg = Status(**msg)
-    resp = msg.resp
+    # resp: str = msg.resp
     oid = msg.oid
     dialog: Dialog = mode.dialogs.get(oid)
 
@@ -1150,19 +1182,32 @@ async def process_trade_msg(
                         mode.on_submit(oid)
 
         case Status(resp='error'):
-
-            # do all the things for a cancel:
-            # - drop order-msg dialog from client table
-            # - delete level line from view
-            mode.on_cancel(oid)
-
             # TODO: parse into broker-side msg, or should we
             # expect it to just be **that** msg verbatim (since
             # we'd presumably have only 1 `Error` msg-struct)
             broker_msg: dict = msg.brokerd_msg
+
+            # XXX NOTE, this presumes the rxed "error" is
+            # order-dialog-cancel-causing, THUS backends much ONLY
+            # relay errors of this "severity"!!
             log.error(
-                f'Order {oid}->{resp} with:\n{pformat(broker_msg)}'
+                f'Order errored ??\n'
+                f'oid: {oid!r}\n'
+                f'\n'
+                f'{pformat(broker_msg)}\n'
+                f'\n'
+                f'=> CANCELLING ORDER DIALOG <=\n'
+
+                # from tractor.devx.pformat import ppfmt
+                # !TODO LOL, wtf the msg is causing
+                # a recursion bug!
+                # -[ ] get this shit on msgspec stat!
+                # f'{ppfmt(broker_msg)}'
             )
+            # do all the things for a cancel:
+            # - drop order-msg dialog from client table
+            # - delete level line from view
+            mode.on_cancel(oid)
 
         case Status(resp='canceled'):
             # delete level line from view
@@ -1178,10 +1223,10 @@ async def process_trade_msg(
             # TODO: UX for a "pending" clear/live order
             log.info(f'Dark order triggered for {fmtmsg}')
 
+        # TODO: do the struct-msg version, blah blah..
+        # req=Order(exec_mode='live', action='alert') as req,
         case Status(
             resp='triggered',
-            # TODO: do the struct-msg version, blah blah..
-            # req=Order(exec_mode='live', action='alert') as req,
             req={
                 'exec_mode': 'live',
                 'action': 'alert',