Fix #1717 : Disable task editing if task was deleted as a result of deleting its parent (#1936)

* Disable task editing if task was deleted as a result of deleting its parent

* Optimize logic for bigger number of tasks

* Don't try to disable editing if not editing in the first place

src/blenderbim/blenderbim/bim/module/sequence/operator.py

@@ -513,13 +513,25 @@ class RemoveTask(bpy.types.Operator):
     def _execute(self, context):
         props = context.scene.BIMWorkScheduleProperties
         self.file = IfcStore.get_file()
+        edited_task_ifc = self.file.by_id(props.active_task_id) if props.active_task_id else None
+
         ifcopenshell.api.run(
             "sequence.remove_task",
             self.file,
-            task=IfcStore.get_file().by_id(self.task),
+            task=self.file.by_id(self.task),
         )
         Data.load(self.file)
         bpy.ops.bim.enable_editing_tasks(work_schedule=props.active_work_schedule_id)
+
+        if edited_task_ifc:
+            if not any(
+                task
+                for task in context.scene.BIMTaskTreeProperties.tasks
+                if task.ifc_definition_id == props.active_task_id
+                and self.file.by_id(props.active_task_id) == edited_task_ifc
+            ):  # Task was deleted
+                bpy.ops.bim.disable_editing_task()
+
         return {"FINISHED"}