Blender Git Loki

Fix most of 'disappearing' first letter in right-aligned labels.

BLF' blf_font_width_to_strlen() could easily generate strings with up to
nearly two pixels length over requested limit!

Note that the fiddling between floats and ints values make things really
confusing here... :/

There is still a few limit cases where, even though computed str length
is now always below reauested limit, we still get first letter
disappearing, no idea why currently.