Multiple panels wrongly overlay each other when fixed to certain output

Submitted by flu..@..ki.org

Assigned to Xfce Bug Triage

Link to original bug (#15648)

Description

Hello,

I'm using multiple monitors (3) on several locations and have panels configures in the following way:

Panel 0 is the "main" panel with menu, window and action buttons, tray icons. Ouput is set to "Primary", which is always eDP-1 LCD display on ThinkPad T480s.

Panels 1-3 have Ouput assigned to different outputs (DP-1, HDMI-1, DP-2). These panels only have Window Buttons configured, showing only applications from these monitors and these outputs are never set as Primary. Each panel should only be visible on certain output.

However when I undock laptop or disable additional outputs with xrandr. I see random Panel 1-3 overlayed on top of Panel 0 on Primary eDP-1 output, hiding its content. If I force panel redraw (switch mode from horizontal to vertical and back to horizontal), panel then hides itself either behind Panel 0 (or out of eDP-1). This is quite annoying as I lose menus and action buttons on my primary monitor.

Tested with xfce4-panel 4.13.5 and with latest xfce4-panel-git xfce+4.14pre1+36+g306856ca-1 on Arch Linux.

Version: Unspecified