Fix T58439: Info Editor does not show operator reports immediately when

operator cancelled.

Lots of operators return OPERATOR_CANCELLED when no data really changed.
Reports from those operators do not show immediately in the Info Editor
[they only do if the operator returns OPERATOR_FINISHED].

Now also notify the Info Editor in case of OPERATOR_CANCELLED.

Maniphest Tasks: T58439

Differential Revision: https://developer.blender.org/D7238

source/blender/windowmanager/intern/wm_event_system.c

@@ -870,6 +870,10 @@ static void wm_operator_reports(bContext *C, wmOperator *op, int retval, bool ca
     }
   }
 
+  /* Refresh Info Editor with reports immediately, even if op returned OPERATOR_CANCELLED. */
+  if ((retval & OPERATOR_CANCELLED) && !BLI_listbase_is_empty(&op->reports->list)) {
+    WM_event_add_notifier(C, NC_SPACE | ND_SPACE_INFO_REPORT, NULL);
+  }
   /* if the caller owns them, handle this */
   wm_add_reports(op->reports);
 }