> Date: Sat, 23 May 2020 21:42:24 +0100 > From: Richard Wordingham <richard.wording...@ntlworld.com> > > > As for different scripts: if the character codepoints are the same, > > Emacs currently assigns each character to a single script. > > I'll need to dig deeper. Composition of both 'a' and Greek alpha with > an acute accent works, which suggest that the problem isn't there for > characters with a script property of 'inherited'.
Emacs currently leaves it up to HarfBuzz to guess the script, as it doesn't yet have the necessary smarts. > > Emacs 24.4 is very old, and doesn't use HarfBuzz. Please try Emacs 27 > > instead, it has several bugs in this area fixed, and will use HarfBuzz > > if available at build time. > > The behaviour in 27.05 is the almost the same as for 24.4, but the > breaking in item (1) is automatically repaired. The process seems slow > - I can see the glyph become final and then revert back to being > medial. I'm puzzled by not being able to step into lam-alif but being > able to step through a series 'beh's. The step into command for > advancing codepoint by codepoint semiworks. The cluster shaping > doesn't break at the cursor - Handa gave me a C code fix so I could > achieve that - but the number of steps into to pass through a cluster > matches the number of codepoints. > > Pressing the 'delete' key still deletes a single character, but may be > that because it's mapped to tpu-delete-current-char. If you press DEL (or Backspace), it will delete a single codepoint. > So, what's not working in Arabic is that one can't move the cursor > through ligatures. That's a feature (you can disable it with disable-point-adjustment). The rest of your observations seem to be too Emacs-specific to discuss here. You are welcome to submit an Emacs bug report if you think something isn't working as it should, or would like to discuss Emacs-specific details. Thanks. _______________________________________________ HarfBuzz mailing list HarfBuzz@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/harfbuzz
