maintainer-feedback requested: [Bug 241212] x11-wm/xfce4: xfce-4.14 is broken! The error was 'GLXBadPixmap'!

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-xfce mailing list
<xfce at FreeBSD.org> for maintainer-feedback:
Bug 241212: x11-wm/xfce4: xfce-4.14 is broken! The error was 'GLXBadPixmap'!
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241212



--- Description ---
After update Xfce to 4.14, I get errors:

Current version of pixman: 0.38.4
	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sat Oct 12 03:21:19 2019
(==) Using config file: "/etc/X11/xorg.conf"
gpg-agent[58995]: WARNING: "--write-env-file" is an obsolete option - it has no
effect
gpg-agent: a gpg-agent is already running - not starting a new one

(xfce4-session:58974): xfce4-session-#[1;33mWARNING#[0m **:
#[34m03:21:23.428#[0m: gpg-agent returned no PID in the variables

(xfwm4:58996): Gdk-#[1;31mERROR#[0m **: #[34m03:21:26.414#[0m: The program
'xfwm4' received an X Window System error.
This probably reflects a bug in the program.
The error was 'GLXBadPixmap'.
  (Details: serial 0 error_code 173 request_code 153 (GLX) minor_code 16)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

After that, I rollback to version 4.12 ...

root at vladiom:~ # pkg version -v | grep -e xorg -e pixman -e gdk -e glx -e gpg
gdk-pixbuf2-2.38.1		   =   up-to-date with index
gpgme-1.13.1			   =   up-to-date with index
gpgme-cpp-1.13.1		   =   up-to-date with index
gpgme-qt5-1.13.1		   =   up-to-date with index
gstreamer1-plugins-gdkpixbuf-1.14.4 =	up-to-date with index
libgpg-error-1.36		   =   up-to-date with index
pixman-0.38.4			   =   up-to-date with index
xorg-cf-files-1.0.6		   =   up-to-date with index
xorg-fonts-truetype-7.7_1	   =   up-to-date with index
xorg-macros-1.19.2		   =   up-to-date with index
xorg-server-1.18.4_12,1 	   =   up-to-date with index
xorgproto-2019.1		   =   up-to-date with index

root at vladiom:~ # pkg version -v | grep xfce
libxfce4menu-4.12.1_2		   <   needs updating (index has 4.14.1)
libxfce4util-4.12.1		   <   needs updating (index has 4.14.0)
xfce-4.12_1			   <   needs updating (index has 4.14)
xfce-icons-elementary-0.13.1	   =   up-to-date with index
xfce4-appfinder-4.12.0_1	   <   needs updating (index has 4.14.0)
xfce4-bsdcpufreq-plugin-0.2_3	   =   up-to-date with index
xfce4-conf-4.12.1		   <   needs updating (index has 4.14.1)
xfce4-cpugraph-plugin-1.1.0_1	   =   up-to-date with index
xfce4-desktop-4.12.5		   <   needs updating (index has 4.14.1)
xfce4-mixer-4.11.0_5		   =   up-to-date with index
xfce4-netload-plugin-1.3.2	   =   up-to-date with index
xfce4-notes-plugin-1.8.1_2	   =   up-to-date with index
xfce4-notifyd-0.4.4_1		   =   up-to-date with index
xfce4-panel-4.12.2		   <   needs updating (index has 4.14.1)
xfce4-screenshooter-plugin-1.9.5   <   needs updating (index has 1.9.6)
xfce4-session-4.12.1_6		   <   needs updating (index has 4.14.0_1)
xfce4-settings-4.12.4_3 	   <   needs updating (index has 4.14.1)
xfce4-systemload-plugin-1.2.3	   =   up-to-date with index
xfce4-taskmanager-1.2.2_2	   =   up-to-date with index
xfce4-terminal-0.8.8_1		   =   up-to-date with index
xfce4-tumbler-0.2.7		   <   needs updating (index has 0.2.7_1)
xfce4-weather-plugin-0.10.0	   =   up-to-date with index
xfce4-whiskermenu-plugin-2.3.3	   =   up-to-date with index
xfce4-wm-4.12.5_1		   <   needs updating (index has 4.14.0_1)
xfce4-xkb-plugin-0.8.1_2	   =   up-to-date with index

root at vladiom:~ # pkg version -v | grep nvidia
nvidia-driver-340-340.107_4	   =   up-to-date with index
nvidia-settings-435.21		   =   up-to-date with index
nvidia-xconfig-435.21		   =   up-to-date with index

root at vladiom:~ # uname -srm
FreeBSD 12.1-RC1 amd64

Whats wrong?
With Xfce 4.12 all works is fine!

P.S.
Second monitor is no detecting in Xfce 4.14 too!!!