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Re: Sv: Sv: Sv: Support for background transparency

From: Po Lu
Subject: Re: Sv: Sv: Sv: Support for background transparency
Date: Wed, 26 Jan 2022 09:00:11 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.60 (gnu/linux)

Håkon Flatval <hkon20@hotmail.com> writes:

> When I remove the "#if defined (USE_GTK) && defined (USE_CAIRO)"
> preprocessor statement in src/xfns.c and then configure with
> --without-cairo, I see some visual artifacts in the result. For
> instance, when marking text, the marked region becomes transparent
> (without even having set the alpha-background parameter yet).

I installed most of the code that can be used to resolve that on master
several days ago.

> If I instead configure with --with-x-toolkit=lucid, Emacs outright
> crashes on startup with the message
> "X protocol error: BadMatch (invalid parameter attributes) on protocol 
> request 70".

Could you run Emacs like this:

    ./emacs -q -xrm 'Emacs.synchronous: true'

And show a backtrace in GDB from the crash?  Thanks.

> I get no such error on these two build configurations when the
> preprocessor statement is in place.
> I tested this using i3 wm on Gentoo.
> In time I would like to see background transparency supported for other
> configurations as well, but leaving the preprocessor statements in seems
> like the easiest way to avoid havoc.

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