Code review comment for lp:mir/0.27

> Following the MirAL test plan there's a problem with sizing "fullscreen"
> surfaces on a tiling Window manager. Vis:
>
> $ miral-app --window-manager tiling
> [in miral app session] $ mir_demo_client_eglplasma
>
> Expect: plasma starts in the LH tile.
> Actual: plasma starts fullscreen

A manifestation of bug 1701308