New feature optionally to accelerate auto-repeated scrolling.
src/xdisp.c: Remove "static" from declaration of Qfontification_functions. src/window.c (window_scroll): bind fontification-functions to nil when scrolling by whole screens and fast-but-imprecise-scrolling is non-nil. (syms_of_window): New DEFVAR_BOOL fast-but-imprecise-scrolling. src/lisp.h (bool): Declare Qfontification_functions extern. lisp/cus-start.el (all): Add fast-but-imprecise-scrolling. doc/emacs/display.texi (Scrolling): fast-but-imprecise-scrolling. Describe new variable. etc/NEWS: Add entry for fast-but-imprecise-scrolling.
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