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patch 9.1.1385: inefficient loop for 'nosmoothscroll' scrolling

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Problem:  Loop that ensures "w_skipcol" is zero with 'nosmoothscroll'
	  for (half)-page scrolling is inefficient.
Solution: Calculate the required "count" instead of looping until
	  "w_skipcol" is zero (Luuk van Baal).

fixes: #17301
closes: #17306

Signed-off-by: Luuk van Baal <luukvbaal@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Luuk van Baal
2025-05-12 20:45:41 +02:00
committed by Christian Brabandt
parent 13bea589a2
commit acf0ebe8a8
3 changed files with 20 additions and 6 deletions
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9
src/testdir/test_normal.vim
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@@ -4345,4 +4345,13 @@ func Test_scroll_longline_scrolloff()
bwipe!
endfunc
" Benchmark test for Ctrl-F with 'nosmoothscroll'
func Test_scroll_longline_benchmark()
call setline(1, ['foo'->repeat(20000)] + [''])
let start = reltime()
exe "normal! \<C-F>"
call assert_inrange(0, 0.1, reltimefloat(reltime(start)))
bwipe!
endfunc
" vim: shiftwidth=2 sts=2 expandtab nofoldenable