Fix wxListCtrl::EndEditLabel() which simply didn't work.

Also document it (even though it's wxMSW-only for now) and add a test for it
in the sample.

Closes #7663.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64368 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/listctrl.h

@@ -247,6 +247,23 @@ public:
     wxTextCtrl* EditLabel(long item,
                           wxClassInfo* textControlClass = CLASSINFO(wxTextCtrl));
 
+    /**
+        Finish editing the label.
+
+        This method allows to programmatically end editing a list control item
+        in place. Usually it will only be called when editing is in progress,
+        i.e. if GetEditControl() returns non-NULL.
+
+        Currently only implemented in wxMSW.
+
+        @param cancel If @true, discard the changes made by user, as if @c
+            Escape key was pressed. Otherwise, accept the changes as if @c
+            Return was pressed.
+        @return @true if item editing wad finished or @false if no item as
+            being edited.
+     */
+    bool EndEditLabel(bool cancel);
+
     /**
         Ensures this item is visible.
     */