Add Popup.isProxy

ext/fg/js/frontend.js

@@ -22,7 +22,7 @@ class Frontend extends TextScanner {
         super(
             window,
             ignoreNodes,
-            [popup.getContainer()],
+            popup.isProxy() ? [] : [popup.getContainer()],
             [(x, y) => this.popup.containsPoint(x, y)]
         );
 

ext/fg/js/popup-proxy.js

@@ -48,6 +48,10 @@ class PopupProxy {
 
     // Public functions
 
+    isProxy() {
+        return true;
+    }
+
     async setOptions(options) {
         const id = await this._getPopupId();
         return await this._invokeHostApi('setOptions', {id, options});

ext/fg/js/popup.js

@@ -52,6 +52,10 @@ class Popup {
 
     // Public functions
 
+    isProxy() {
+        return false;
+    }
+
     async setOptions(options) {
         this.options = options;
         this.updateTheme();