Re: Redisplay problems?

[Stefan Monnier]

> But it's a redraw when we expose a hitherto invisible/obscured frame
> whose contents have changed while it was invisible/obscured.

Yes, of course, but you can look at it as "deiconify with the old
display content" (without recomputing matrices nor redrawing) followed
by a normal redisplay (which may recompute matrices and/or redraw
depending on whether something actually did change while the frame was
invisible).

>> Part of the reason it's still fuzzy is that xdisp.c seems to recompute
>> the matrices when it finds a "garbaged" frame,
> But we do have to compute the new matrices to know whether they have
> changed.  I'm fully confused now.

No, if the "redisplay" bits are "false" we know that nothing has changed.


        Stefan