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Mention jit-lock deferred as an alternative to fast-but-imprecise-scrolling

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* doc/emacs/display.texi (Scrolling): Add a paragraph on using jit-lock
deferred fontification as a way of obviating Emacs hanging after
auto-repeated scrolling.
This commit is contained in:
Alan Mackenzie 2020-04-11 21:04:50 +00:00
parent fd27685c1e
commit cf57663f2a
1 changed files with 9 additions and 0 deletions
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doc/emacs/display.texi
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@ -141,6 +141,15 @@ default face. This can cause Emacs to scroll to somewhat wrong buffer
positions when the faces in use are not all the same size, even with positions when the faces in use are not all the same size, even with
single (i.e., without auto-repeat) scrolling operations. single (i.e., without auto-repeat) scrolling operations.
@vindex jit-lock-defer-time
As an alternative to setting @code{fast-but-imprecise-scrolling} you
might prefer to enable jit-lock deferred fontification (@pxref{Font
Lock}). To do this, customize @code{jit-lock-defer-time} to a small
positive number such as 0.25, or even 0.1 if you type quickly. This
gives you less jerky scrolling when you hold down @kbd{C-v}, but the
window contents after any action which scrolls into a fresh portion of
the buffer will be momentarily unfontified.
@vindex scroll-up @vindex scroll-up
@vindex scroll-down @vindex scroll-down
@findex scroll-up-line @findex scroll-up-line