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vim-patch:9.0.0908: with 'smoothscroll' cursor may end up in wrong position

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Problem:    With 'smoothscroll' cursor may end up in wrong position.
Solution:   Correct the computation of screen lines. (Yee Cheng Chin,
            closes vim/vim#11502)

361895d2a1

Co-authored-by: Yee Cheng Chin <ychin.git@gmail.com>
This commit is contained in:
Luuk van Baal
2023-04-27 19:40:00 +02:00
parent 26a9f0e94e
commit 46646a9bb8
3 changed files with 96 additions and 8 deletions
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41
test/functional/legacy/scroll_opt_spec.lua
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@@ -410,7 +410,7 @@ describe('smoothscroll', function()
it("adjusts the cursor position in a long line", function()
screen:try_resize(40, 6)
exec([[
call setline(1, ['one', 'two', 'Line' .. (' with lots of text'->repeat(30))])
call setline(1, ['one', 'two', 'Line' .. (' with lots of text'->repeat(30)) .. ' end', 'four'])
set smoothscroll scrolloff=0
normal 3G10|zt
]])
@@ -502,6 +502,45 @@ describe('smoothscroll', function()
ith lots of text with lots of text with |
|
]])
-- 'scrolloff' set to 0, move cursor down one line. Cursor should move properly,
-- and since this is a really long line, it will be put on top of the screen.
exec('set scrolloff=0')
feed('0j')
screen:expect([[
^four |
~ |
~ |
~ |
~ |
|
]])
-- Repeat the step and move the cursor down again.
-- This time, use a shorter long line that is barely long enough to span more
-- than one window. Note that the cursor is at the bottom this time because
-- Vim prefers to do so if we are scrolling a few lines only.
exec("call setline(1, ['one', 'two', 'Line' .. (' with lots of text'->repeat(10)) .. ' end', 'four'])")
feed('3Gztj')
screen:expect([[
<<<th lots of text with lots of text wit|
h lots of text with lots of text with lo|
ts of text with lots of text with lots o|
f text with lots of text end |
^four |
|
]])
-- Repeat the step but this time start it when the line is smooth-scrolled by
-- one line. This tests that the offset calculation is still correct and
-- still end up scrolling down to the next line with cursor at bottom of
-- screen.
feed('3Gzt<C-E>j')
screen:expect([[
<<<th lots of text with lots of text wit|
h lots of text with lots of text with lo|
ts of text with lots of text with lots o|
f text with lots of text end |
fou^r |
|
]])
end)
-- oldtest: Test_smoothscroll_one_long_line()