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bug#20537: 25.0.50; `compose-string-internal` does not work properly on
bug#20537: 25.0.50; `compose-string-internal` does not work properly on OSX.
Sat, 09 May 2015 21:52:57 +0300
> Date: Sat, 09 May 2015 11:27:15 -0700
> From: Keith David Bershatsky <address@hidden>
> The function `compose-string-internal` does not work properly when running
> Emacs built on OSX. The following example works on Windows, but not OSX --
> it "should be" the letter A with a pipe running through the center of the
> letter A. Depending upon the arguments passed to `compose-string-internal`
> when using Emacs on OSX, the pipe is either displayed to the right (at
> various distances) or is not visible at all -- it never displays "on top of"
> the target character.
> (defun test-fn ()
> (message (compose-string-internal "A|" 0 (length "A|"))))
Character composition depends on the font driver doing TRT. Which
font driver does your Emacs use, and does that driver support complex