Khaled Hosny • Loop over glyphs once per draw call
Instead of looping over glyphs for each anchor, loop over them once per
draw call.
This seems to make things noticeable faster for fonts with relatively
large number of glyphs. Still slower than native mark cloud (especially
when moving by keyboard), but much more usable now.
Fixes https:/
/github.com/simoncozens/ShowAnchorCloud/issues/14