Since we scale the GPU matrix a certain way (in order to draw a round
circle even for different UI x/y scaling), we have to also compensate
with GPU matrix translation (instead of drawing the raw
frame/value as coords untranslated).
There might be ways to solve this differently (e.g. manipulating the passed
coords instead of the GPU matrix or having a version of imm_drawcircball
that can do this in a way that compensates UI view scaling), but this seems
to be the most straightforward.
Thx @mano-wii hinting at the way to do this with GPU matrix alone.
Should probably go into 3.3 LTS as well.
Pull Request: https://projects.blender.org/blender/blender/pulls/108979
d61d2e5f59