Remove use of `tractor.run()`

piker/ui/_exec.py

@@ -159,20 +159,20 @@ def run_qtractor(
         'main': instance,
     }
 
-    # setup tractor entry point args
-    main = partial(
-        tractor._main,
-        async_fn=func,
-        args=args + (widgets,),
+    # define tractor entrypoint
+    async def main():
+
+        async with tractor.open_root_actor(
             arbiter_addr=(
-            tractor._default_arbiter_host,
-            tractor._default_arbiter_port,
+                tractor._root._default_arbiter_host,
+                tractor._root._default_arbiter_port,
             ),
             name='qtractor',
             **tractor_kwargs,
-    )
+        ) as a:
+            await func(*(args + (widgets,)))
 
-    # guest mode
+    # guest mode entry
     trio.lowlevel.start_guest_run(
         main,
         run_sync_soon_threadsafe=run_sync_soon_threadsafe,

piker/ui/_style.py

@@ -112,8 +112,6 @@ CHART_MARGINS = (0, 0, 2, 2)
 _min_points_to_show = 6
 _bars_from_right_in_follow_mode = int(6**2)
 _bars_to_left_in_follow_mode = int(6**3)
-
-
 _tina_mode = False