fix: issue-456 dropdown open/close bug

fix bug causing menu to toggle

 - Fix a bug where multiple clicks on a dropdown trigger would cause the
    dropdown to open/close on the 2nd+ clicks

     - Behaviour would also occur for the select component which
     leverages
        the dropdown component

         - Special consideration was given to the scenario where a
         select
            component has a label; where upon clicking the label the
               dropdown's _handleClick would be called, but the click
               event
                  would not contain the dropdown-trigger (which is the
                  select).
                     Which would previously call both the _handleClick
                     and
                        _handleDocumentClick functions causing the same
                        open/close behaviour

Author: warrenspe

src/dropdown.ts

@@ -197,22 +197,24 @@ export class Dropdown extends Component<DropdownOptions> implements Openable {
   }
 
   _setupTemporaryEventHandlers() {
-    // Use capture phase event handler to prevent click
-    document.body.addEventListener('click', this._handleDocumentClick, true);
+    document.body.addEventListener('click', this._handleDocumentClick);
     document.body.addEventListener('touchmove', this._handleDocumentTouchmove);
     this.dropdownEl.addEventListener('keydown', this._handleDropdownKeydown);
   }
 
   _removeTemporaryEventHandlers() {
-    // Use capture phase event handler to prevent click
-    document.body.removeEventListener('click', this._handleDocumentClick, true);
+    document.body.removeEventListener('click', this._handleDocumentClick);
     document.body.removeEventListener('touchmove', this._handleDocumentTouchmove);
     this.dropdownEl.removeEventListener('keydown', this._handleDropdownKeydown);
   }
 
   _handleClick = (e: MouseEvent) => {
     e.preventDefault();
-    this.open();
+    if (this.isOpen) {
+        this.close();
+    } else {
+        this.open();
+    }
   }
 
   _handleMouseEnter = () => {
@@ -245,17 +247,18 @@ export class Dropdown extends Component<DropdownOptions> implements Openable {
       !this.isTouchMoving
     ) {
       // isTouchMoving to check if scrolling on mobile.
-      //setTimeout(() => {
       this.close();
-      //}, 0);
     }
     else if (
-      target.closest('.dropdown-trigger') ||
       !target.closest('.dropdown-content')
     ) {
-      //setTimeout(() => {
-      this.close();
-      //}, 0);
+      // Do this one frame later so that if the element clicked also triggers _handleClick
+      // For example, if a label for a select was clicked, that we don't close/open the dropdown
+      setTimeout(() => {
+        if (this.isOpen) {
+          this.close();
+        }
+      }, 0);
     }
     this.isTouchMoving = false;
   }
@@ -592,7 +595,9 @@ export class Dropdown extends Component<DropdownOptions> implements Openable {
     this.dropdownEl.style.display = 'block';
     this._placeDropdown();
     this._animateIn();
-    this._setupTemporaryEventHandlers();
+    // Do this one frame later so that we don't bind an event handler that's immediately
+    // called when the event bubbles up to the document and closes the dropdown
+    setTimeout(() => this._setupTemporaryEventHandlers(), 0);
   }
 
   /**