Could be related to: xfwm4: Workspaces should have different margins for different screen on multihead https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=530965
- Bug#530965: xfwm4: Workspaces should have different margin... Zenaan Harkness
- Bug#530965: xfwm4: Workspaces should have different m... Zenaan Harkness
- Bug#832271: xfwm4: maximize behavior differs between ... Zenaan Harkness