Unicode debugging / visual editing aids

[capr]

• show special hex boxes for:

  • invalid bytes
  • control characters

• mark invisible characters positions:

  • ZW-NBSP: prevents ligatures
  • NBSP: prevents word-wrapping
  • SOFT HYPHEN: hyphenate if word-wrapping
  • ZWJ: force joining
  • ZWNJ: prevent joining
  • WORD JOINER: ZW-NBSP-like
  • LTR/RTL modifiers
  • variation selectors
  • hangul fillers

• mark look-alike characters:   ; ꓸ ꓹ ꓽ (called "confusables" in Unicode, see confusables.txt)

• mark runs by script and language

• at cursor:

  • show direction
  • show all codepoints individually between cursor and next cursor
  • shape/show all graphemes individually between cursor and next cursor