diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index f0d7385..5adbb42 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -3697,6 +3697,73 @@
         \ column: 8,
         \ coladd: 21,
         \ }, getmousepos())
+
+  30vnew
+  setlocal smoothscroll number
+  call setline(1, join(range(100)))
+  exe "normal! \<C-E>"
+  call test_setmouse(1, 5)
+  call assert_equal(#{
+        \ screenrow: 1,
+        \ screencol: 5,
+        \ winid: win_getid(),
+        \ winrow: 1,
+        \ wincol: 5,
+        \ line: 1,
+        \ column: 27,
+        \ coladd: 0,
+        \ }, getmousepos())
+  call test_setmouse(2, 5)
+  call assert_equal(#{
+        \ screenrow: 2,
+        \ screencol: 5,
+        \ winid: win_getid(),
+        \ winrow: 2,
+        \ wincol: 5,
+        \ line: 1,
+        \ column: 53,
+        \ coladd: 0,
+        \ }, getmousepos())
+
+  exe "normal! \<C-E>"
+  call test_setmouse(1, 5)
+  call assert_equal(#{
+        \ screenrow: 1,
+        \ screencol: 5,
+        \ winid: win_getid(),
+        \ winrow: 1,
+        \ wincol: 5,
+        \ line: 1,
+        \ column: 53,
+        \ coladd: 0,
+        \ }, getmousepos())
+  call test_setmouse(2, 5)
+  call assert_equal(#{
+        \ screenrow: 2,
+        \ screencol: 5,
+        \ winid: win_getid(),
+        \ winrow: 2,
+        \ wincol: 5,
+        \ line: 1,
+        \ column: 79,
+        \ coladd: 0,
+        \ }, getmousepos())
+
+  vert resize 4
+  call test_setmouse(2, 2)
+  " This used to crash Vim
+  call assert_equal(#{
+        \ screenrow: 2,
+        \ screencol: 2,
+        \ winid: win_getid(),
+        \ winrow: 2,
+        \ wincol: 2,
+        \ line: 1,
+        \ column: 53,
+        \ coladd: 0,
+        \ }, getmousepos())
+
+  bwipe!
   bwipe!
 endfunc