After unlock, window positions sometimes change
Description:
I have a dual screen layout: left one is 1920x1200, right one 3440x144.
Sometimes, after I unlocked the computer and the screen already seems to be restored, both screens flicker once (rarely twice), and xfwm4 seems to rearrange windows back and forth, but loses the exact window positions. All windows on all virtual screens are moved down by the height of the window titlebar. Even the windows that are maximized vertically or totally.
I'm using xfce4-screensaver for locking the screen.
Suggestion:
Even if the root cause is in the screensaver or the graphics driver, I think debouncing screen size changes would be a good thing. When xfwm4 recognizes a screen size change, it should wait half a second (or maybe this could be a user setting) and check again if the size is back to where it was before.