RTGUI version 0.6.2
rtgui_object.c: refactor -- more symmetric code
cleanup: use early return to avoid deep indent levels
don't propagate the events when last_mevent_widget has handled it

If the last_mevent_widget has handled it, we already handled it. Then it
should not propagate to other widgets. This fix the issue in
http://www.rt-thread.org/phpBB3/viewtopic.php?f=3&t=2695

Reported-by: softwind on the forum