Send generic wxListCtrl wxEVT_COMMAND_LIST_KEY_DOWN events from OnKeyDown rather than OnChar. Also remove the HasCurrent check. These changes bring the generic control into line with the control under wxMSW. Re-enable the previously failing unit test and document that the key down event might not have a valid item associated with it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65586 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/listctrl.h

@@ -1085,7 +1085,7 @@ protected:
     @event{EVT_LIST_ITEM_RIGHT_CLICK(id, func)}
         The right mouse button has been clicked on an item.
     @event{EVT_LIST_KEY_DOWN(id, func)}
-        A key has been pressed.
+        A key has been pressed. GetIndex() may be -1 if no item is selected. 
     @event{EVT_LIST_INSERT_ITEM(id, func)}
         An item has been inserted.
     @event{EVT_LIST_COL_CLICK(id, func)}