Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!CORY.BERKELEY.EDU!dillon
From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Why redraw a window when moved?
Message-ID: <8805050713.AA08001@cory.Berkeley.EDU>
Date: 5 May 88 07:13:58 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 13

:Why does Intuition send a REDISPLAY (or whatever it's called -- I don't
:have my manuals with me) message to me for a SIMPLE_REFRESH window when
:it's moved, even if the window is entirely visible?  Why doesn't
:Intuition just bitblt from the old place on the screen to the new place?
:This was a surprise to me!

	Although moving a window may appear to be trivial, one must
remember that the algorithm involved must deal with the possibility of
other overlapping and underlapping windows.  In this particular case,
I believe that the window's contents does get partially overwritten (or
maybe it's a condition that intuition isn't sure of, and so doesn't 
take any chances).

					-Matt