collidoscope reports on situations where paths overlap in a shaped piece of
text.

This software tries every combination of glyphs within a specified Unicode range
and up to a specified length of string and outputs a report of all situations
where the glyphs collide. It has a number of collision tests:
- Paths in non-adjacent glyphs are never allowed to collide.
- If the cursive test is turned on, then paths with a cursive attachment anchor
  are allowed to overlap with paths in an adjacent glyph which also contain a
  cursive attachment anchor, but are not allowed to overlap with a path without
  a cursive attachment anchor.
- If the area test is turned on, then paths in adjacent glyphs may collide so
  long as the area of overlap does not exceed a given percentage of the smallest
  path's area. i.e. if the area percentage is set to 25%, then two strokes may
  connect, because the overlap is likely to be quite small compared to the size
  of the paths involved. But if a stroke significantly overlaps a nukta, it will
  be reported as a collision. (Of course, this will not detect strokes which
  merely graze a nukta.)