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I think this may be as much a problem with the fonts as with emacs.

I've been using Ubuntu's mono font for emacs, and activating with:

(set-face-attribute 'default nil :font "Ubuntu Mono")

However, I can reliably get emacs to hang:

  1. Set the font with (set-face-attribute 'default nil :font "Ubuntu Mono").
  2. In any buffer (including *scratch* of a freshly-started emacs)
  3. Do a query-replace, it does not matter if anything is found or replaced.

  4. Do another query-replace. This time, emacs should provide the previous search/replace as default, something ala:

    Query replace (foo --> bar): _

    where the --> is actually a fancy arrow, not dash-dash-greaterthan. Emacs always slows down a little in this part.

  5. Interrupt (C-g) before completing the act. Emacs hangs (for me).

If I do not set the font (fresh emacs) or set it to another font (e.g., "Consolas"), no such slow-down or hang occurs with the same steps.

If the font is somehow incomplete or incompatible, is there a way to make emacs more resilient to the problem? (Besides, of course, not using that font.)

Versions: win10_64, emacs-25.2.1 (vgoulet's 25.2mod3), ubuntu mono 0.80 (dtd 2011; non-mono fonts are 0.83 from 2015)

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    If you can reliably get Emacs to hang, especially when starting Emacs using emacs -Q (no init file), then file an Emacs bug report: M-x report-emacs-bug. If you cannot do that then bisect your init file to find the culprit. Commented Jan 30, 2018 at 1:52
  • Submitted. I thought to ask here first, in case somebody else has seen it and/or could identify a simple thing I was missing. Thanks. Commented Jan 30, 2018 at 1:59
  • Yes, it's good to ask here first. You still might get a useful answer. Commented Jan 30, 2018 at 3:49
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    For troubleshooting and potentially as a workaround (depending on the result of the troubleshooting), you might want to customise the value of the query replace separator — e.g. use ` -> ` (literally), rather than ` → ` (setq query-replace-from-to-separator " -> ") or via M-x customize-variable RET query-replace-from-to-separator. [Stackexchange is inexplicably messing up my formatting — it works if I try it as an answer.] Commented Jan 30, 2018 at 14:28
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    That fixes things, @aplaice. (The filed bug, if you're curious.) If you'd like, feel free to submit as an answer. Commented Jan 31, 2018 at 5:17

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