Consecutive RTL GlyphRuns are drawn from the last to the first.
References
#538, #7149, all those issues asking for RTL closed as dupes.
As @miniksa suggested in a comment on #7149 -- handle the thingy on the
render side.
If we have GlyphRuns abcdEFGh, where EFG are RTL, we draw them now in
order abcdGFEh.
This has ransom-noting, because I didn't touch the font scaling at all.
This should fix the majority of RTL issues, except it *doesn't* fix
issues with colors, because those get split in the TextBuffer phase in
the renderer I think, so they show up separately by the GlyphRun phase.
60b44c856e