Lexical: Updated dropdown handling to match tinymce behaviour

Now toolbars stay open on mouse-out, and close on other toolbar open,
outside click or an accepted action.
To support:
- Added new system to track and manage open dropdowns.
- Added way for buttons to optionally emit events upon actions.
- Added way to listen for events.
- Used the above to control when dropdowns should hide on action, since
  some dont (like overflow containers and split dropdown buttons).

resources/js/wysiwyg/ui/framework/blocks/dropdown-button.ts

@@ -1,4 +1,3 @@
-import {handleDropdown} from "../helpers/dropdowns";
 import {EditorContainerUiElement, EditorUiElement} from "../core";
 import {EditorBasicButtonDefinition, EditorButton} from "../buttons";
 import {el} from "../../../utils/dom";
@@ -8,6 +7,7 @@ export type EditorDropdownButtonOptions = {
     showOnHover?: boolean;
     direction?: 'vertical'|'horizontal';
     showAside?: boolean;
+    hideOnAction?: boolean;
     button: EditorBasicButtonDefinition|EditorButton;
 };
 
@@ -15,6 +15,7 @@ const defaultOptions: EditorDropdownButtonOptions = {
     showOnHover: false,
     direction: 'horizontal',
     showAside: undefined,
+    hideOnAction: true,
     button: {label: 'Menu'},
 }
 
@@ -40,7 +41,7 @@ export class EditorDropdownButton extends EditorContainerUiElement {
                 },
                 isActive: () => {
                     return this.open;
-                }
+                },
             });
         }
 
@@ -65,7 +66,7 @@ export class EditorDropdownButton extends EditorContainerUiElement {
             class: 'editor-dropdown-menu-container',
         }, [button, menu]);
 
-        handleDropdown({toggle: button, menu : menu,
+        this.getContext().manager.dropdowns.handle({toggle: button, menu : menu,
             showOnHover: this.options.showOnHover,
             showAside: typeof this.options.showAside === 'boolean' ? this.options.showAside : (this.options.direction === 'vertical'),
             onOpen : () => {
@@ -76,6 +77,12 @@ export class EditorDropdownButton extends EditorContainerUiElement {
             this.getContext().manager.triggerStateUpdateForElement(this.button);
         }});
 
+        if (this.options.hideOnAction) {
+            this.onEvent('button-action', () => {
+                this.getContext().manager.dropdowns.closeAll();
+            }, wrapper);
+        }
+
         return wrapper;
     }
 }