glmark2-es2 --fullscreen on XWayland is not fullscreen

[Saviq]

One way to reproduce:

mir_performance_tests --gtest_filter=GLMark2Xwayland.fullscreen

There should be no decoration afaict?

[wmww]

Odd. Fullscreen works fine on all other XWayland apps tested (Gedit, Kate and Blender). Stranger still glmark2-es2 --fullscreen seems to be intermittently fullscreen on sway (about one every ten runs it's windowed). Will investigate.

[wmww]

Ah! it's setting _NET_WM_STATE before mapping the window. We were ignoring that because X11 apps are supposed to use a client message to change that property, but according to the protocol apps can set it initially and the window manager should respect that.