xwayland: Clear output buffers on scale change

5 jobs for scaling-mr in 7 minutes and 33 seconds (queued for 5 seconds)
latest
Status Name Job ID Coverage
  Docker Image
passed debian-buster #13027507

00:00:33

 
  Build And Test
passed autotools #13027508

00:07:00

passed meson #13027509

00:02:49

passed meson-noglamor #13027510

00:02:14

passed mingw-cross-build #13027511

00:00:52