[Editor] Unload addons before quitting to allow cleanup.

editor/editor_node.cpp

@@ -3322,6 +3322,13 @@ void EditorNode::_exit_editor(int p_exit_code) {
 	// Dim the editor window while it's quitting to make it clearer that it's busy.
 	dim_editor(true);
 
+	// Unload addons before quitting to allow cleanup.
+	for (const KeyValue<String, EditorPlugin *> &E : addon_name_to_plugin) {
+		print_verbose(vformat("Unloading addon: %s", E.key));
+		remove_editor_plugin(E.value, false);
+		memdelete(E.value);
+	}
+
 	get_tree()->quit(p_exit_code);
 }