Our text wrapping code is written in a way that requires the Line Feed
character to be in our glyph cache. This is problematic as none of the
control characters will ever be there if not using fallback. With
fallback these glyphs could be a zero-width character from a symbol
font, or something with width if using a last resort font. So we'd have
to ignore the advance in the latter case. This came to a head recently
because we are turning off fallback in some circumstances. 12b1f8bd7a
removed the rendering of control characters so they are never in the
cache. That change requires this one, which does wrapping based on the
string's codepoint, not that of its glyph.
Pull Request: https://projects.blender.org/blender/blender/pulls/135196
f930b7a731