Add workaround to avoid UI elements added multiple times.:

Author: arnowelzel

README.md

@@ -38,6 +38,10 @@ const fullscreenPlugin = new PhotoSwipeFullscreen(lightbox, {
 
 ## Changelog
 
+### 1.0.3
+
+Added workaround to avoid fullscreen button registered multiple times when PhotoSwipe is triggering the callback multiple times.
+
 ### 1.0.2
 
 Added option to translate the UI label.

photoswipe-fullscreen.esm.js

@@ -1,5 +1,5 @@
 /**
- * PhotoSwipe fullscreen plugin v1.0.2
+ * PhotoSwipe fullscreen plugin v1.0.3
  *
  * Inspired by https://github.com/dimsemenov/PhotoSwipe/issues/1759
  *
@@ -16,9 +16,8 @@ class PhotoSwipeFullscreen {
             ...defaultOptions,
             ...options
         };
-
         this.lightbox = lightbox;
-
+		this.uiInit = false;
         this.lightbox.on('init', () => {
             this.initPlugin();
         });
@@ -35,6 +34,10 @@ class PhotoSwipeFullscreen {
             '</svg>';
 
         if (this.fullscreenAPI) {
+			if (this.uiInit) {
+				return;
+			}
+			this.uiInit = true;
             this.lightbox.on('uiRegister', () => {
                 this.pswp.ui.registerElement({
                     name: 'fullscreen-button',