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| author | Eli Zaretskii <eliz@gnu.org> | 2018-06-01 15:34:30 +0300 |
|---|---|---|
| committer | Eli Zaretskii <eliz@gnu.org> | 2018-06-01 15:34:30 +0300 |
| commit | e5471b2381e885d5d214bfa09ab0c35275fc6048 (patch) | |
| tree | 7f7b32284052f74a3603a9f1516558741f1f29fc | |
| parent | 61c8434fec7aa45b939137f8ab90c5d5b8cfa4b4 (diff) | |
| download | emacs-e5471b2381e885d5d214bfa09ab0c35275fc6048.tar.gz | |
Add commentary for subtle aspect of frame.el
* lisp/frame.el: Explain why we use symbol-function when adding
watchers for certain variables that need to trigger redisplay.
| -rw-r--r-- | lisp/frame.el | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lisp/frame.el b/lisp/frame.el index 447413b3256..29c31f41cb1 100644 --- a/lisp/frame.el +++ b/lisp/frame.el @@ -2475,6 +2475,9 @@ See also `toggle-frame-maximized'." ;; F5 then produces the correct effect, the variable doesn't need ;; to be in this list; otherwise, it does. (mapc (lambda (var) + ;; Using symbol-function here tells the watcher machinery to + ;; call the C function set-buffer-redisplay directly, thus + ;; avoiding a potential GC. (add-variable-watcher var (symbol-function 'set-buffer-redisplay))) '(line-spacing overline-margin |