Revert "Skip mouse button release events in wxGenericTreeCtrl."

This reverts r76094 as it broke label editing in the control.

See #16055, closes #16573.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77891 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/treectlg.cpp

@@ -3709,9 +3709,7 @@ void wxGenericTreeCtrl::OnMouse( wxMouseEvent &event )
 #endif
         }
     }
-    else if ( event.LeftUp() || event.RightUp() )
-    {
-        if ( m_isDragging )
+    else if ( (event.LeftUp() || event.RightUp()) && m_isDragging )
     {
         ReleaseMouse();
 
@@ -3746,11 +3744,6 @@ void wxGenericTreeCtrl::OnMouse( wxMouseEvent &event )
 #endif
     }
     else
-        {
-            event.Skip();
-        }
-    }
-    else
     {
         // If we got to this point, we are not dragging or moving the mouse.
         // Because the code in carbon/toplevel.cpp will only set focus to the