2 files changed, 33 insertions, 0 deletions
diff --git a/test/functional/legacy/scroll_opt_spec.lua b/test/functional/legacy/scroll_opt_spec.lua
index a5a6aded79..3b755ff3e8 100644
--- a/test/functional/legacy/scroll_opt_spec.lua
+++ b/test/functional/legacy/scroll_opt_spec.lua
@@ -174,6 +174,24 @@ describe('smoothscroll', function()
     screen:expect(s8)
   end)
 
+  -- oldtest: Test_smoothscroll_multibyte()
+  it('works with multibyte characters', function()
+    screen:try_resize(40, 6)
+    exec([[
+      set scrolloff=0 smoothscroll
+      call setline(1, [repeat('ϛ', 45), repeat('2', 36)])
+      exe "normal G35l\<C-E>k"
+    ]])
+    screen:expect([[
+      ϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛϛ^ϛϛϛϛϛ|
+      ϛϛϛϛϛ                                   |
+      222222222222222222222222222222222222    |
+      ~                                       |
+      ~                                       |
+                                              |
+    ]])
+  end)
+
   -- oldtest: Test_smoothscroll_number()
   it("works 'number' and 'cpo'+=n", function()
     exec([[
diff --git a/test/old/testdir/test_scroll_opt.vim b/test/old/testdir/test_scroll_opt.vim
index f9f33b20eb..d7be074168 100644
--- a/test/old/testdir/test_scroll_opt.vim
+++ b/test/old/testdir/test_scroll_opt.vim
@@ -124,6 +124,21 @@ func Test_smoothscroll_CtrlE_CtrlY()
   call StopVimInTerminal(buf)
 endfunc
 
+func Test_smoothscroll_multibyte()
+  CheckScreendump
+
+  let lines =<< trim END
+      set scrolloff=0 smoothscroll
+      call setline(1, [repeat('ϛ', 45), repeat('2', 36)])
+      exe "normal G35l\<C-E>k"
+  END
+  call writefile(lines, 'XSmoothMultibyte', 'D')
+  let buf = RunVimInTerminal('-S XSmoothMultibyte', #{rows: 6, cols: 40})
+  call VerifyScreenDump(buf, 'Test_smoothscroll_multi_1', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 func Test_smoothscroll_number()
   CheckScreendump