Skip mouse button release events in wxGenericListCtrl.

This is similar to r76093 for wxGenericTreeCtrl and fixes a similar problem:
clicking in a wxListCtrl inside wxNotebook confused GtkNotebook mouse tracking
logic because it didn't get some events.

Closes #16365.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76822 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/listctrl.cpp

@@ -2426,6 +2426,9 @@ void wxListMainWindow::OnMouse( wxMouseEvent &event )
         {
             // reset the selection and bail out
             HighlightAll(false);
+
+            if ( event.LeftUp() )
+                event.Skip();
         }
 
         return;
@@ -2501,6 +2504,8 @@ void wxListMainWindow::OnMouse( wxMouseEvent &event )
         }
 
         m_lineSelectSingleOnUp = (size_t)-1;
+
+        event.Skip();
     }
     else
     {