Whenever there is overlays, set a title on main chart price-y axis!

piker/ui/_axes.py

@@ -215,13 +215,17 @@ class PriceAxis(Axis):
         # self.setLabel(title)
         # self.showLabel()
 
-        label = self.title = Label(
+        label: Label | None = self.title
-            view=view or self.linkedView(),
+        if label is None:
-            fmt_str=title,
+            label = self.title = Label(
-            color=color or self.text_color,
+                view=view or self.linkedView(),
-            parent=self,
+                fmt_str=title,
-            # update_on_range_change=False,
+                color=color or self.text_color,
-        )
+                parent=self,
+                # update_on_range_change=False,
+            )
+        else:
+            label.fmt_str: str = title
 
         def below_axis() -> QPointF:
             return QPointF(

piker/ui/_chart.py

@@ -1121,8 +1121,23 @@ class ChartPlotWidget(pg.PlotWidget):
         # add axis title
         # TODO: do we want this API to still work?
         # raxis = pi.getAxis('right')
-        axis = self.pi_overlay.get_axis(pi, axis_side)
+        overlay: PlotItemOverlay = self.pi_overlay
-        axis.set_title(axis_title or name, view=pi.getViewBox())
+
+        # Whenever overlays exist always add a y-axis label to the
+        # main axis as well!
+        for name, axis_info in self.plotItem.axes.items():
+            axis = axis_info['item']
+            if isinstance(axis, PriceAxis):
+                axis.set_title(self.linked.mkt.pair())
+
+        axis: PriceAxis = overlay.get_axis(
+            pi,
+            axis_side,
+        )
+        axis.set_title(
+            axis_title or name,
+            view=pi.getViewBox(),
+        )
 
         return pi
 
@@ -1213,11 +1228,13 @@ class ChartPlotWidget(pg.PlotWidget):
 
         if add_sticky:
 
-            if pi is not self.plotItem:
+            main_pi: pgo.PlotItem = self.plotItem
+            if pi is not main_pi:
                 # overlay = self.pi_overlay
                 # assert pi in overlay.overlays
                 overlay = self.pi_overlay
                 assert pi in overlay.overlays
+                assert main_pi is overlay.root_plotitem
                 axis = overlay.get_axis(
                     pi,
                     add_sticky,

piker/ui/_display.py

@@ -1289,7 +1289,7 @@ async def display_symbol_data(
         hist_ohlcv: ShmArray = flume.hist_shm
 
         mkt: MktPair = flume.mkt
-        fqme = mkt.fqme
+        fqme: str = mkt.fqme
 
         hist_chart = hist_linked.plot_ohlc_main(
             mkt,
@@ -1386,7 +1386,7 @@ async def display_symbol_data(
 
                 hist_pi = hist_chart.overlay_plotitem(
                     name=fqme,
-                    axis_title=fqme,
+                    axis_title=flume.mkt.pair(),
                 )
 
                 hist_viz = hist_chart.draw_curve(
@@ -1416,7 +1416,7 @@ async def display_symbol_data(
 
                 rt_pi = rt_chart.overlay_plotitem(
                     name=fqme,
-                    axis_title=fqme,
+                    axis_title=flume.mkt.pair(),
                 )
 
                 rt_viz = rt_chart.draw_curve(