wayland: prevent resizing of fixed-size window

GNOME/mutter#1331
6 jobs for !1368 with fixed_size in 8 minutes and 42 seconds (queued for 2 seconds)
detached
Status Job ID Name Coverage
  Review
passed #807439
check-commit-log

00:00:21

 
  Build
passed #807440
build-mutter

00:02:25

passed #807442
build-without-native-backend-and-wayland

00:01:49

passed #807441
build-without-opengl-and-glx

00:03:41

 
  Test
passed #807444
can-build-gnome-shell

00:02:01

passed #807443
test-mutter

00:04:38