WIP: st/label: Enlarge the paint volume to include text-shadow
Having an inaccurate paint volume didn't matter until ae338af1, but
after that having too small a paint volume resulted in apparent clipping.
Not because clip_to_allocation
is set, but just because the offscreen
framebuffer is sized to be as small as possible.
This is half of #4409 (closed)
Edited by Daniel van Vugt