bug#11070: 24.0.94; Large stippled images not displayed consistently

[Lars Ingebrigtsen <larsi@gnus.org>]

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Eli Zaretskii <eliz@gnu.org> writes:

> Then some redisplay optimization is at work here.  If your build was
> configured with --enable-checking=glyphs, does the problem go away if
> you set _all_ of the following variable non-nil?
>
>   inhibit-try-cursor-movement
>   inhibit-try-window-id
>   inhibit-try-window-reusing

No, that doesn't change anything.

But I now see more clearly what's not being updated -- it copies all the
bits in the background on the line that's being moved.

Here's the display first:


[-- Attachment #2: stip1.jpg --]
[-- Type: image/jpeg, Size: 86798 bytes --]

[-- Attachment #3: Type: text/plain, Size: 98 bytes --]


Then I hit RET before the first line.  The entire line moves down,
background stipples and all:


[-- Attachment #4: stip2.jpg --]
[-- Type: image/jpeg, Size: 83777 bytes --]

[-- Attachment #5: Type: text/plain, Size: 13 bytes --]


And again:


[-- Attachment #6: stip3.jpg --]
[-- Type: image/jpeg, Size: 88263 bytes --]

[-- Attachment #7: Type: text/plain, Size: 104 bytes --]


-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no