Refactor visibility management in slideshow and video playback; optimize state updates and debounce observer for improved performance.

Jellyfin.Plugin.MediaBarEnhanced/Web/mediaBarEnhanced.css

@@ -999,14 +999,3 @@
 .layout-tv .backdrop-container{
   top: -5%;
 }
-
-/* .layout-tv .video-backdrop {
-  mask-image: linear-gradient(to top,
-      #fff0 2%,
-      rgb(0 0 0 / 0.5) 6%,
-      #000000 8%);
-  -webkit-mask-image: linear-gradient(to top,
-      #fff0 2%,
-      rgb(0 0 0 / 0.5) 6%,
-      #000000 8%);
-} */

Jellyfin.Plugin.MediaBarEnhanced/Web/mediaBarEnhanced.js

@@ -1432,16 +1432,19 @@ const VisibilityObserver = {
     
     // If a full screen video player is active, hide slideshow and stop playback
     if ((videoPlayer && !videoPlayer.classList.contains('hide')) || (trailerPlayer && !trailerPlayer.classList.contains('hide'))) {
-        const container = document.getElementById("slides-container");
+        if (this._lastVisibleState !== 'player-active') {
-        if (container) {
+            this._lastVisibleState = 'player-active';
-            container.style.display = "none";
+            const container = document.getElementById("slides-container");
-            container.style.visibility = "hidden";
+            if (container) {
-            container.style.pointerEvents = "none";
+                container.style.display = "none";
+                container.style.visibility = "hidden";
+                container.style.pointerEvents = "none";
+            }
+            if (STATE.slideshow.slideInterval) {
+                STATE.slideshow.slideInterval.stop();
+            }
+            SlideshowManager.stopAllPlayback();
         }
-        if (STATE.slideshow.slideInterval) {
-            STATE.slideshow.slideInterval.stop();
-        }
-        SlideshowManager.stopAllPlayback();
         return;
     }
 
@@ -1456,20 +1459,27 @@ const VisibilityObserver = {
       activeTab &&
       activeTab.getAttribute("data-index") === "0";
 
-    container.style.display = isVisible ? "block" : "none";
+    const newState = isVisible ? 'visible' : 'hidden';
-    container.style.visibility = isVisible ? "visible" : "hidden";
+    
-    container.style.pointerEvents = isVisible ? "auto" : "none";
+    // Only update DOM and trigger actions when state actually changes
+    if (this._lastVisibleState !== newState) {
+      this._lastVisibleState = newState;
+      
+      container.style.display = isVisible ? "block" : "none";
+      container.style.visibility = isVisible ? "visible" : "hidden";
+      container.style.pointerEvents = isVisible ? "auto" : "none";
 
-    if (isVisible) {
+      if (isVisible) {
-      if (STATE.slideshow.slideInterval && !STATE.slideshow.isPaused) {
+        if (STATE.slideshow.slideInterval && !STATE.slideshow.isPaused) {
-        STATE.slideshow.slideInterval.start();
+          STATE.slideshow.slideInterval.start();
-        SlideshowManager.resumeActivePlayback();
+          SlideshowManager.resumeActivePlayback();
+        }
+      } else {
+        if (STATE.slideshow.slideInterval) {
+          STATE.slideshow.slideInterval.stop();
+        }
+        SlideshowManager.stopAllPlayback();
       }
-    } else {
-      if (STATE.slideshow.slideInterval) {
-        STATE.slideshow.slideInterval.stop();
-      }
-      SlideshowManager.stopAllPlayback();
     }
   },
 
@@ -1477,7 +1487,13 @@ const VisibilityObserver = {
    * Initializes visibility observer
    */
   init() {
-    const observer = new MutationObserver(() => this.updateVisibility());
+    // MARK: Mark
+    // const observer = new MutationObserver(() => this.updateVisibility());
+    let debounceTimer = null;
+    const observer = new MutationObserver(() => {
+      if (debounceTimer) clearTimeout(debounceTimer);
+      debounceTimer = setTimeout(() => this.updateVisibility(), 250);
+    });
     observer.observe(document.body, { childList: true, subtree: true });
 
     document.body.addEventListener("click", () => this.updateVisibility());
@@ -1700,6 +1716,7 @@ const SlideCreator = {
                   const iframe = event.target.getIframe();
                   if (iframe) {
                     iframe.setAttribute('tabindex', '-1');
+                    iframe.setAttribute('inert', '');
                   }
 
                   // Store start/end time and videoId for later use
@@ -2772,8 +2789,26 @@ const SlideshowManager = {
     const currentSlide = document.querySelector(`.slide[data-item-id="${currentItemId}"]`);
     if (!currentSlide) return;
 
-    // Use playCurrentVideo to properly restore video with correct mute state
+    // YouTube player: just resume, don't reload
-    this.playCurrentVideo(currentSlide, currentItemId);
+    const ytPlayer = STATE.slideshow.videoPlayers?.[currentItemId];
+    if (ytPlayer && typeof ytPlayer.playVideo === 'function') {
+      if (STATE.slideshow.isMuted) {
+        if (typeof ytPlayer.mute === 'function') ytPlayer.mute();
+      } else {
+        if (typeof ytPlayer.unMute === 'function') ytPlayer.unMute();
+        if (typeof ytPlayer.setVolume === 'function') ytPlayer.setVolume(40);
+      }
+      ytPlayer.playVideo();
+      return;
+    }
+
+    // HTML5 video: just resume, don't reset currentTime
+    const html5Video = currentSlide.querySelector('video.video-backdrop');
+    if (html5Video) {
+      html5Video.muted = STATE.slideshow.isMuted;
+      if (!STATE.slideshow.isMuted) html5Video.volume = 0.4;
+      html5Video.play().catch(e => console.warn("Error resuming HTML5 video:", e));
+    }
   },
 
   /**