dashed glyph names in groups

[frankrolf]

When a group (e.g. @GROUP = [ A-test B C ];) contains a dashed glyph name that’s missing in the UFO file, the error output is as follows:

in top-level feature file 'features.fea' :
  ERROR: [line     4 char  12] Glyph "test" not in font.
  FATAL: [line     4 char  12] Invalid glyph range [A-test]

It seems that the group parsing assumes both A-C and A - C to be the same.
We updated the range notation to require spaces around the dash after our arm got twisted by a specific font editor, which unilaterally introduced dashes in glyph names.

[skef]

I think this was intentional. The idea was that when finding a hyphen in a glyph name, first check to see if there is a glyph with that name, and if not treat the string as a range. So this is just the effect of that double-level interpretation.

Presumably this would be an error either way, so if there is a problem it is that the error message doesn't mention both possibilities, but that seems pretty subtle.