xfwm4-4.13.0 with epoxy blinks the window decorations

Submitted by Jason Zaman

Assigned to Olivier Fourdan @olivier

Description

I'm on the latest xfwm4 on gentoo and the window decorations will sometimes blink randomly. It must be related to the new vsync stuff. It happens a lot but I not completely reliably so I cant give very reliable steps to repro :(. It happens less on maximized things, and much more when the windows are unmaximized.

Compositor off and Xpresent are fine: $ xfwm4 --replace --compositor=off & $ XFWM4_USE_PRESENT=1 xfwm4 --replace & If i switch back to epoxy then i get blinks randomly: $ xfwm4 --replace &

Some things that trigger it (unreliably):

switching through workspaces really quickly with the scroll wheel
open https://git.xfce.org/ in chrome and have a terminal or other window on top then move the cursor over the text for a while and the decorations disappear then very quickly reappear. Sometimes if i move the mouse slower it takes longer to reappear?

I have these versions installed: media-libs/libepoxy-1.4.1 media-libs/mesa-13.0.5 $ xfwm4 -V This is xfwm4 version 4.13.0 (revision a46bb00) for Xfce 4.12 Released under the terms of the GNU General Public License. Compiled against GTK+-2.24.31, using GTK+-2.24.31.

Build configuration and supported features:
- Startup notification support:                 Yes
- XSync support:                                Yes
- Render support:                               Yes
- Xrandr support:                               Yes
- Xpresent support:                             Yes
- Embedded compositor:                          Yes
- Epoxy support:                                Yes
- KDE systray proxy (deprecated):               No

I'm using the modesetting driver and have an intel integrated gfx chip.

Let me know how I can help debug further :)