fix drop down direction fallback persist after closing the menu

Author: vegegoku

domino-ui/src/main/java/org/dominokit/domino/ui/menu/direction/DropDirection.java

@@ -25,6 +25,9 @@
 
 /** DropDirection interface. */
 public interface DropDirection {
+
+  String DUI_POSITION_FALLBACK = "dui-position-fallback";
+
   /**
    * init.
    *
@@ -53,15 +56,14 @@ default void cleanSelf(Element source) {}
 
   default DropDirection fallBackPosition(DropDirectionContext context, SpaceChecker spaceChecker) {
     DominoElement<Element> source = elementOf(context.getSource());
-    if (dui_menu.isAppliedTo(context.getSource())
-        && !source.hasAttribute("dui-position-fallback")) {
+    if (dui_menu.isAppliedTo(context.getSource()) && !source.hasAttribute(DUI_POSITION_FALLBACK)) {
       source.setCssProperty(spaceChecker.getMaximumSideSpaceProperty());
       source.setCssProperty(spaceChecker.getMaximumVerticalSpaceProperty());
 
       context.newSpaceChecker();
 
       DropDirection position = position(context);
-      source.setAttribute("dui-position-fallback", true);
+      source.setAttribute(DUI_POSITION_FALLBACK, true);
       return position;
     }
     return MIDDLE_SCREEN.position(context);

domino-ui/src/main/java/org/dominokit/domino/ui/menu/direction/MiddleOfScreenDropDirection.java

@@ -31,6 +31,7 @@ public class MiddleOfScreenDropDirection implements DropDirection {
   public DropDirection position(DropDirectionContext context) {
     Element source = context.getSource();
     Element target = context.getTarget();
+    source.removeAttribute(DUI_POSITION_FALLBACK);
     dui_flex_col_reverse.remove(source);
     DOMRect sourceRect = source.getBoundingClientRect();