[C] Fix unwanted point moveage in VM

[Julian Bradfield]

In article <200709191024.l8JAOHiB031508 at krk.inf.ed.ac.uk> Julian Bradfield <jcb+xeb at inf.ed.ac.uk> writes:
>In article <18149.58079.498563.234436 at puma.r.npc.de> Joachim Schrod <jschrod at acm.org> writes:
>>When one moves from one message to another (i.e., evaluates
>>#'vm-next-message), the frame goes completely white and is then
>>rebuild. Is that the "flicker" problem of Julian? This is the same in
>>VM 7.17/7.19 and VM 8.0. I'd think that this behaviour was already
>>there when I still used XEmacs 21.4; I don't remember any change here. 
>>AFAIU, that's done during the construction of the mail's presentation
>>(MIME decoding and so).

>Yes, I guess that's what I mean. On 21.5, it is very visible, and very
>annoying - even on a tty frame, even on a very fast machine. On 21.4,
>it's not visible at all on any machine I use, as far as I can see, so
>I don't know whether it even happens.
>I suppose I could put them under xscope to see what's actually
>happening to the window!

Having now spent a little more time under 21.5, I see that this is not
specifically a VM problem. The same effect occurs with Info mode.

For example, go to the Lispref info node, and do
i put RET

As you , through the 21 index entries (none of which is the one you
want), windows disappear and other windows appear momentarily before
the desired window appears.