[SSD] Incorrectly sizes some windows #3778
Description
When SSDs are applied we need to adjust the size and size constraints as they are relative to the content area, but window management assumes they apply to the full area.
We have code that does this for X11 windows in AbstractShell::create_surface() (c.f. #3567), but that depends on the window spec having width and height set. That may not be the case, so we need to revisit this adjustment when a buffer is submitted. Likely in AbstractShell::surface_ready().