XLIB_SKIP_ARGB_VISUALS and Qt OpenGL application with mesa

[Adam Jackson]

On Fri, 2018-09-21 at 15:14 +0200, Mathieu Westphal wrote:
> Hello Xorg list,
> 
> When using mesa, my Qt OpenGL based application has some transparency
> issue.
> The OpenGL rendering zone is transparent but it should not be.

You've picked the ARGB visual. Don't. Set GLX_ALPHA_SIZE to 0 in
glXChooseFBConfig.

> Since Composite is not enabled by default, it is not expected that
> this issue will be visible to most users.

Whatever documentation this is, is severely out of date. Composite's
been enabled by default since xserver 1.4 in 2007 or so.

- ajax