bug#12906: 24.2.50; Parts of the screen are completely white

[Fabrice Niessen]

Eli,

Eli Zaretskii wrote:
>> From: "Fabrice Niessen" <fni@missioncriticalit.com>
>>
>> I sometimes have parts of the screen "undisplayed" such in the
>> example at http://screencast.com/t/qLMxmSLxYvJ8.
>> 
>> In the beginning, all the line was white (even the fringe!).
>> 
>> While moving the cursor around, some characters are redisplayed correctly.
>> 
>> Paging up and down makes the display correct again.
>
> This is a clear sign that some redisplay optimization is applied when
> it shouldn't be.  IOW, Emacs mistakenly thinks the display does not
> need to be redrawn.
>
>> However, this is not occurring often, and not reproducible per se -- 
>> unluckily.
>
> When that happens next, try typing "M-x".  Just "M-x", without any
> command.  If that doesn't help, try "M-x redraw-display RET".

I'll do, to be sure.

> More importantly, post the result of "C-h l" (that's ell, not the
> digit one), and try to remember what were you doing immediately before
> the incident.

Yep, the lossage buffer.

> Also, in what mode was the current buffer.

It the case I posted here, it was an Org mode buffer. But all my buffers are
(more or less) either in Org, or in Gnus/Message.

Anyway, I'll give you the required information next time it happens.

Best regards,
Fabrice