Only start animations if target component is visible.

core/src/main/java/com/github/weisj/darklaf/graphics/Animator.java

@@ -138,6 +138,11 @@ public abstract class Animator {
         this.enabled = enabled;
     }
 
+    public void resume(final int startFrame, final JComponent target) {
+        if (!target.isVisible() || !target.isShowing()) return;
+        resume(startFrame);
+    }
+
     public void resume(final int startFrame) {
         if (startFrame < 0) {
             throw new IllegalArgumentException("Starting frame must be non negative.");

core/src/main/java/com/github/weisj/darklaf/ui/scrollpane/DarkScrollBarListener.java

@@ -200,14 +200,14 @@ public class DarkScrollBarListener extends MouseAdapter implements AdjustmentLis
         if (scrollbar != null && (scrollbar.getValueIsAdjusting() || overAnimatedComponent)) {
             fadeOutAnimator.suspend();
             int startFrame = (int) ((currentAlpha / maxAlpha) * fadeInAnimator.getTotalFrames());
-            fadeInAnimator.resume(startFrame);
+            fadeInAnimator.resume(startFrame, scrollbar);
         } else {
             fadeInAnimator.suspend();
             int startFrame = 0;
             if (currentAlpha < maxAlpha) {
                 startFrame = (int) ((1.0 - currentAlpha / maxAlpha) * (fadeOutAnimator.getTotalFrames()));
             }
-            fadeOutAnimator.resume(startFrame);
+            fadeOutAnimator.resume(startFrame, scrollbar);
         }
     }
 

core/src/main/java/com/github/weisj/darklaf/ui/togglebutton/DarkToggleButtonListener.java

@@ -85,7 +85,7 @@ public class DarkToggleButtonListener extends DarkButtonListener<DarkToggleButto
             animator.suspend();
             animator.setForward(sel);
             animator.setEndValue(endState);
-            animator.resume(startFrame);
+            animator.resume(startFrame, button);
         }
     }