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patch 9.1.0413: smoothscroll may cause infinite loop

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Problem:  smoothscroll may cause infinite loop, with
          very narrow windows
          (Jaehwang Jung, after v9.1.0280)
Solution: Check for width1 being negative, verify
          that win_linetabsize does not overflow

fixes: #14750
closes: #14772

Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Christian Brabandt
2024-05-15 21:35:36 +02:00
parent fed01960d2
commit eff20eb35d
4 changed files with 44 additions and 8 deletions
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10
src/testdir/test_normal.vim
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@@ -4268,4 +4268,14 @@ func Test_halfpage_longline()
call assert_equal(2, line('.'))
bwipe!
endfunc
" Test for Ctrl-E with long line and very narrow window,
" used to cause an inifite loop
func Test_scroll_longline_no_loop()
4vnew
setl smoothscroll number showbreak=> scrolloff=2
call setline(1, repeat(['Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.'], 3))
exe "normal! \<C-E>"
bwipe!
endfunc
" vim: shiftwidth=2 sts=2 expandtab nofoldenable