Sometimes the titlebar doesn't hide like it's supposed to do and it takes a restart of the concerned application for it to work again.
déc. 01 17:33:01 terence-arch gnome-shell[1911]: X Error of failed request: BadWindow (invalid Window parameter)
déc. 01 17:33:01 terence-arch gnome-shell[1911]: Major opcode of failed request: 18 (X_ChangeProperty)
déc. 01 17:33:01 terence-arch gnome-shell[1911]: Resource id in failed request: 0x2800176
déc. 01 17:33:01 terence-arch gnome-shell[1911]: Serial number of failed request: 13
déc. 01 17:33:01 terence-arch gnome-shell[1911]: Current serial number in output stream: 15
déc. 01 17:33:09 terence-arch gnome-shell[1911]: X Error of failed request: BadWindow (invalid Window parameter)
déc. 01 17:33:09 terence-arch gnome-shell[1911]: Major opcode of failed request: 18 (X_ChangeProperty)
déc. 01 17:33:09 terence-arch gnome-shell[1911]: Resource id in failed request: 0x28001a3
déc. 01 17:33:09 terence-arch gnome-shell[1911]: Serial number of failed request: 13
déc. 01 17:33:09 terence-arch gnome-shell[1911]: Current serial number in output stream: 15