tests, stacking: Add tests with no-input and no-take-focus windows

When a window with no frame, that doesn't accept focus and that has no
take-focus atom set is destroyed, we ended up in not changing the current_focus
window, causing a crash.

Added test cases that verify this situation.

Related to https://gitlab.gnome.org/GNOME/mutter/issues/308
https://gitlab.gnome.org/GNOME/mutter/merge_requests/307

src/tests/meson.build

@@ -111,6 +111,9 @@ stacking_tests = [
   'basic-wayland',
   'client-side-decorated',
   'closed-transient',
+  'closed-transient-no-input-no-take-focus-parent',
+  'closed-transient-no-input-no-take-focus-parents',
+  'closed-transient-no-input-parent',
   'minimized',
   'mixed-windows',
   'set-parent',

src/tests/stacking/closed-transient-no-input-no-take-focus-parent.metatest

@@ -0,0 +1,21 @@
+new_client 1 x11
+create 1/1
+show 1/1
+
+create 1/2 csd
+set_parent 1/2 1
+can_take_focus 1/2 false
+accept_focus 1/2 false
+show 1/2
+
+create 1/3 csd
+set_parent 1/3 2
+show 1/3
+
+wait
+assert_stacking 1/1 1/2 1/3
+
+destroy 1/3
+
+wait
+assert_stacking 1/1 1/2

src/tests/stacking/closed-transient-no-input-no-take-focus-parents.metatest

@@ -0,0 +1,23 @@
+new_client 1 x11
+create 1/1
+accept_focus 1/1 false
+can_take_focus 1/1 false
+show 1/1
+
+create 1/2 csd
+set_parent 1/2 1
+can_take_focus 1/2 false
+accept_focus 1/2 false
+show 1/2
+
+create 1/3 csd
+set_parent 1/3 2
+show 1/3
+
+wait
+assert_stacking 1/1 1/2 1/3
+
+destroy 1/3
+wait
+
+assert_stacking 1/1 1/2

src/tests/stacking/closed-transient-no-input-parent.metatest

@@ -0,0 +1,20 @@
+new_client 1 x11
+create 1/1
+show 1/1
+
+create 1/2 csd
+set_parent 1/2 1
+accept_focus 1/2 false
+show 1/2
+
+create 1/3 csd
+set_parent 1/3 2
+show 1/3
+
+wait
+assert_stacking 1/1 1/2 1/3
+
+destroy 1/3
+
+wait
+assert_stacking 1/1 1/2