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bug#30539: 26.0; `char-displayable-p' is much slower in Emacs 25 and 26

From: Noam Postavsky
Subject: bug#30539: 26.0; `char-displayable-p' is much slower in Emacs 25 and 26
Date: Thu, 22 Feb 2018 20:49:23 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux)

Drew Adams <address@hidden> writes:

> Can someone please confirm that they can repro this problem?

I can reproduce on a Windows 10 box.  It looks like something was being
cached before, where now it's not.  E.g., try the following function
(char-names as defined in your throw-mule-bug-2.el).  In Emacs 24,
there's only one slow call.

(defun my-test-each-char ()
  (pcase-dolist (`(,name . ,ch) char-names)
    (read-char (format "continue? (next: %s)" name))
    (let ((t0 (current-time))
          dt displayable)
      (setq displayable (char-displayable-p ch))
      (setq dt (subtract-time (current-time) t0))
      (message "%s display:%s (%fs)" name displayable (float-time dt)))))

Doing (setq inhibit-compacting-font-caches t) brings back reasonable

I can't reproduce on my GNU/Linux box, although that may just be due to
different fonts installed.  In particular, char-displayable-p never gave
me nil.

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