vim-patch:9.0.0672: line partly shows with 'smoothscroll' and 'scrolloff' zero

Problem:    Cursor line only partly shows with 'smoothscroll' and 'scrolloff'
            zero.
Solution:   Do not use 'smoothscroll' when adjusting the bottom of the window.
            (closes vim/vim#11269)

https://github.com/vim/vim/commit/9bab7a024393200bb2c03b3abddfda86436990a7

Co-authored-by: Bram Moolenaar <Bram@vim.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/test/functional/legacy/scroll_opt_spec.lua b/test/functional/legacy/scroll_opt_spec.lua
index 90417d93f3..c63401cb02 100644
--- a/test/functional/legacy/scroll_opt_spec.lua
+++ b/test/functional/legacy/scroll_opt_spec.lua
@@ -301,4 +301,30 @@ describe('smoothscroll', function()
     feed('<C-E>')
     screen:expect_unchanged()
   end)
+
+  -- oldtest: Test_smoothscroll_wrap_scrolloff_zero()
+  it("works with zero 'scrolloff'", function()
+    screen:try_resize(40, 8)
+    exec([[
+      call setline(1, ['Line' .. (' with some text'->repeat(7))]->repeat(7))
+      set smoothscroll scrolloff=0
+      :3
+    ]])
+    screen:expect([[
+      <<<h some text with some text           |
+      Line with some text with some text with |
+      some text with some text with some text |
+      with some text with some text           |
+      ^Line with some text with some text with |
+      some text with some text with some text |
+      with some text with some text           |
+                                              |
+    ]])
+    feed('j')
+    screen:expect_unchanged()
+    feed('<C-E>j')
+    screen:expect_unchanged()
+    feed('G')
+    screen:expect_unchanged()
+  end)
 end)