Added missing update of dist script.

dist/iwmlib.pixi.js

@@ -6053,6 +6053,10 @@
     window.Capabilities = Capabilities;
     window.CapabilitiesTests = CapabilitiesTests;
 
+    /** Basic class for poppable elements that need to be closed as soon as one poppable is
+     * shown.
+     */
+
     /* eslint-disable no-unused-vars */
     /**
      * A base class for scatter specific events.
@@ -12628,6 +12632,9 @@
 
         onMove(event, interaction) {
             let delta = interaction.delta();
+            if (delta == null) {
+                return
+            }
             this.scroll += delta.x;
             while (this.deltas.length > 10) {
                 this.deltas.pop(0);
@@ -14863,7 +14870,7 @@
      * @extends Popup
      * @see {@link https://www.iwm-tuebingen.de/iwmbrowser/lib/pixi/popupmenu.html|DocTest}
      */
-    class PopupMenu extends Popup {
+    class PopupMenu$1 extends Popup {
         
         /**
          * Creates an instance of a PopupMenu.
@@ -15512,7 +15519,7 @@
     window.Stylus = Stylus;
     window.Switch = Switch;
     window.Popup = Popup;
-    window.PopupMenu = PopupMenu;
+    window.PopupMenu = PopupMenu$1;
     window.Modal = Modal;
     window.Volatile = Volatile;
     window.Message = Message;