Add EVT_RIBBONBAR_TAB_LEFT_DCLICK event.

Generate a special event when a ribbon bar is double clicked.

Closes #12399.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65674 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/ribbon/bar.h

@@ -101,6 +101,8 @@ public:
         Triggered when the right mouse button is pressed on a tab.
     @event{EVT_RIBBONBAR_TAB_RIGHT_UP(id, func)}
         Triggered when the right mouse button is released on a tab.
+    @event{EVT_RIBBONBAR_TAB_LEFT_DCLICK(id, func)}
+        Triggered when the left mouse button is double clicked on a tab.
     @endEventTable
 
     @library{wxribbon}