Drop `update_graphics_from_flow()`

piker/ui/_chart.py

@@ -1287,24 +1287,6 @@ class ChartPlotWidget(pg.PlotWidget):
             **draw_curve_kwargs,
         )
 
-    def update_graphics_from_flow(
-        self,
-        graphics_name: str,
-        array_key: Optional[str] = None,
-
-        **kwargs,
-
-    ) -> pg.GraphicsObject:
-        '''
-        Update the named internal graphics from ``array``.
-
-        '''
-        viz = self._vizs[array_key or graphics_name]
-        return viz.update_graphics(
-            array_key=array_key,
-            **kwargs,
-        )
-
     # TODO: pretty sure we can just call the cursor
     # directly not? i don't wee why we need special "signal proxies"
     # for this lul..

piker/ui/_fsp.py

@@ -707,9 +707,7 @@ async def open_vlm_displays(
 
         last_val_sticky.update_from_data(-1, value)
 
-        _, vlm_curve = vlm_chart.update_graphics_from_flow(
+        _, vlm_curve = vlm_viz.update_graphics()
-            'volume',
-        )
 
         # size view to data once at outset
         vlm_chart.view._set_yrange(