After entering dual screen windows extend below the panel

Submitted by car..@..il.com

Assigned to Olivier Fourdan @olivier

Link to original bug (#14519)

Description

I have a panel at the bottom of my laptop screen. When I plug an external monitor and configure it to be above my laptop display, which is the primary display containing the panel, windows maximized in the monitor with the panel extends below it as if I had toggle not to reserve borders in the panel configuration. This doesn't happen before plugging the external monitor.