Fix a bug where screenshots would say on screen forever

source/funkin/util/plugins/ScreenshotPlugin.hx

@@ -73,6 +73,15 @@ class ScreenshotPlugin extends FlxBasic
 
     onPreScreenshot = new FlxTypedSignal<Void->Void>();
     onPostScreenshot = new FlxTypedSignal<Bitmap->Void>();
+
+    FlxG.signals.postStateSwitch.add(onStateSwitchComplete);
+  }
+
+  public function onStateSwitchComplete():Void
+  {
+    trace('Stage switch complete! Removing screenshot preview sprite if it exists.');
+    FlxG.stage.removeChild(previewSprite);
+    previewSprite = null;
   }
 
   public override function update(elapsed:Float):Void
@@ -162,6 +171,8 @@ class ScreenshotPlugin extends FlxBasic
 
   final CAMERA_FLASH_DURATION = 0.25;
 
+  var previewSprite:Null<Sprite> = null;
+
   /**
    * Visual and audio feedback when a screenshot is taken.
    */
@@ -215,7 +226,7 @@ class ScreenshotPlugin extends FlxBasic
     preview.draw(bitmap.bitmapData, matrix);
 
     // used for movement + button stuff
-    var previewSprite = new Sprite();
+    previewSprite = new Sprite();
 
     previewSprite.buttonMode = true;
     previewSprite.addEventListener(MouseEvent.MOUSE_DOWN, openScreenshotsFolder);
@@ -257,6 +268,7 @@ class ScreenshotPlugin extends FlxBasic
                     previewSprite.removeEventListener(MouseEvent.MOUSE_OUT, onHoverOut);
 
                     FlxG.stage.removeChild(previewSprite);
+                    previewSprite = null;
                   }
                 });
             });