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Add commentary for subtle aspect of frame.el

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* lisp/frame.el: Explain why we use symbol-function when adding
watchers for certain variables that need to trigger redisplay.
This commit is contained in:
Eli Zaretskii 2018-06-01 15:34:30 +03:00
parent 61c8434fec
commit e5471b2381
1 changed files with 3 additions and 0 deletions
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lisp/frame.el
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@ -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