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

[Fabrice Niessen]

Hello 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.

That did not help, in the Org buffer I was just looking at...

> If that doesn't help, try "M-x redraw-display RET".

That did work -- in fact, before applying it!  Why?  Because I typed M-x red
TAB, and a buffer came on the right side of my screen, full with completions.
When that one appeared, the display was corrected.

> 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.  Also, in what mode was the current buffer.

Just browsing the file with C-v/M-v.

I'm sorry, but, by answering to this email first, I'd lost what you wanted
from C-h l.

Best regards,
Fabrice