Re: RFC: flicker-free double-buffered Emacs under X11

[Paul Eggert]

Daniel Colascione wrote:

> I've found the flickering while editing to be very machine-dependent....
> I've found I can reliably reproduce the flickering by isearching for a
> string that appears in a buffer only once, then leaning on C-s.

Weird. I can't reproduce the flickering problem on either Fedora 24 GTK x86-64 
or Ubuntu 16.04.1 GTK x86-64, even though I tried your recipe. I wonder what's 
different about my platforms? Anyway, if the code is fixing a real problem on 
your platforms and doesn't cause trouble elsewhere, we should install it.

> I'll feel more comfortable about removing the lisp interface (and so any
> way for users to this the thing off) once we're sure it's not
> causing problems.

Perhaps mark it as deprecated so that the user knows it might go away?

> if we're C99-only anyway now, we might as well allow
> C99 comments.

Maybe, but that would be a different topic, and should be addressed in a 
separate patch. For example, we might also need to change our C-reading programs.