Mac OS: added support for the text input feature introduced in OS 10.7 "Lion" where pressing and holding

some key opens a window with possible accented characters: added [NSView windowLevel] useful for
fullscreen windows.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9793 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

src/Fl_cocoa.mm

@@ -2100,6 +2100,10 @@ static void  q_set_window_title(NSWindow *nsw, const char * name, const char *mi
   return 0;
 }
 
+- (NSInteger)windowLevel {
+  return [[self window] level];
+}
+
 - (NSInteger)conversationIdentifier {
   return identifier;
 }