Re: address@hidden: Re: Redraw problem with overlapping frames]

[Chong Yidong]

Richard Stallman <address@hidden> writes:

> Can someone please debug this, and ack?

Like I said in an earlier message, I haven't been able to reproduce
this at all.  Maybe a more detailed recipe and more information would
help.

> From: David Kastrup <address@hidden>
> Subject: Re: Redraw problem with overlapping frames
> To: address@hidden
>
> David Kastrup <address@hidden> writes:
>
>> Please write in English if possible, because the Emacs maintainers
>> usually do not have translators to read other languages for them.
>>
>> Your bug report will be posted to the address@hidden mailing list.
>>
>> Please describe exactly what actions triggered the bug
>> and the precise symptoms of the bug:
>>
>> When I have overlapping frames and issue a command in the lower frame
>> that will cause the minibuffer to be extended in size (here:
>> emacs-version), then after the resize, there is redraw cruft in the
>> lower frame (which disappears once the minibuffer is shrunk again).
>> One can't consistently trigger this, and the probability of getting
>> this behavior is much lower when compared to versions from the
>> beginning of the year.  I would not recommend trying to fix this in
>> EMACS_22_BASE as the effect lasts only temporarily (until the
>> minibuffer gets shrunk again).  For Emacs 23, however, one might want
>> to see how it is triggered.
>>
>> I have only ever seen this effect with overlapping Emacs frames from
>> the same session: overlapping frames from other applications possibly
>> don't trigger it (no guarantees, though).  I include a screenshot.
>
> Uh, no guarantees...  It turns out that when I place something like a
> shell window partially obscuring an Emacs frame with, say, a shell
> buffer running some compilation, then I get lots of display cruft in
> the Emacs frame.  The cruft occurs in
> a) the top line partially obscured by the obscuring window
> b) below the bottom line partially obscured
>
> It would appear that scrolling does copy the material in the partially
> obscured cases, but fails to clear the partial lines before
> resp. after moving the displayed material at top resp. bottom.
>
> - -- 
> David Kastrup
>
>
>
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