fix: Duplicate event listener functions

Author: miyuesc

lib/features/toggle-mode/viewer/ToggleMode.js

@@ -20,17 +20,6 @@ export default function ToggleMode(eventBus, canvas, selection) {
 
   this._active = false;
 
-  eventBus.on('import.parse.start', () => {
-
-    if (this._active) {
-      this.toggleMode(false);
-
-      eventBus.once('import.done', () => {
-        this.toggleMode(true);
-      });
-    }
-  });
-
   eventBus.on('diagram.init', () => {
     this._canvasParent = this._canvas.getContainer().parentNode;
 
@@ -83,4 +72,4 @@ ToggleMode.prototype.toggleMode = function(active = !this._active) {
   this._active = active;
 };
 
-ToggleMode.$inject = [ 'eventBus', 'canvas' ];
+ToggleMode.$inject = [ 'eventBus', 'canvas' ];