- the Plugins object combo boxes are no longer updated on object selection on Project tab generally but only for the Plugin that is current, if any

- in Corner Markers Plugin I added a new feature, ability to insert existing markers into external objects. Finished the work for external Gerbers and work in progress for the external Geometry

appPlugins/ToolLevelling.py

@@ -360,15 +360,22 @@ class ToolLevelling(AppTool, CNCjob):
         self.ui.al_frame.setDisabled(True)
 
     def on_object_selection_changed(self, current, previous):
-        try:
-            sel_obj = current.indexes()[0].internalPointer().obj
-            name = sel_obj.options['name']
-            kind = sel_obj.kind
+        found_idx = None
+        for tab_idx in range(self.app.ui.notebook.count()):
+            if self.app.ui.notebook.tabText(tab_idx) == self.ui.pluginName:
+                found_idx = True
+                break
 
-            if kind == 'cncjob':
-                self.ui.object_combo.set_value(name)
-        except IndexError:
-            pass
+        if found_idx:
+            try:
+                sel_obj = current.indexes()[0].internalPointer().obj
+                name = sel_obj.options['name']
+                kind = sel_obj.kind
+
+                if kind == 'cncjob':
+                    self.ui.object_combo.set_value(name)
+            except IndexError:
+                pass
 
     def change_level(self, level):
         """