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; Add some notes about narrowing, font-lock cc-mode issues

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* yasnippet-tests.el (yas--with-font-locked-temp-buffer)
(example-for-issue-474):
* yasnippet.el (yas--snippet-create): Add commentary.
This commit is contained in:
Noam Postavsky 2020-04-13 18:21:21 -04:00
parent 1cc1996074
commit 5b1217ab08
2 changed files with 8 additions and 3 deletions
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4
yasnippet-tests.el
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@ -855,6 +855,8 @@ mapconcat #'(lambda (arg)
(defmacro yas--with-font-locked-temp-buffer (&rest body)
"Like `with-temp-buffer', but ensure `font-lock-mode'."
;; NOTE: Replace all uses of this with `font-lock-ensure' when we
;; drop support for Emacs 24.
(declare (indent 0) (debug t))
(let ((temp-buffer (make-symbol "temp-buffer")))
;; NOTE: buffer name must not start with a space, otherwise
@ -874,6 +876,8 @@ mapconcat #'(lambda (arg)
(kill-buffer ,temp-buffer))))))))
(ert-deftest example-for-issue-474 ()
;; This issue only reproduces in Emacs 24.3, most likely due to some
;; bug in the cc-mode included with that Emacs version.
(yas--with-font-locked-temp-buffer
(c-mode)
(yas-minor-mode 1)

7
yasnippet.el
View File

@ -4178,9 +4178,10 @@ Returns the newly created snippet."
(run-hook-with-args 'before-change-functions begin end)
(let ((before-change-functions nil)
(after-change-functions nil))
;; Some versions of cc-mode fail when inserting snippet
;; content in a narrowed buffer, so make sure to insert
;; before narrowing.
;; Some versions of cc-mode (might be the one with Emacs
;; 24.3 only) fail when inserting snippet content in a
;; narrowed buffer, so make sure to insert before
;; narrowing.
(insert content)
(narrow-to-region begin (point))
(goto-char (point-min))