vim-patch:9.0.2022: getmousepos() returns wrong index for TAB char (#25636)

Problem:  When clicking in the middle of a TAB, getmousepos() returns
          the column of the next char instead of the TAB.
Solution: Break out of the loop when the vcol to find is inside current
          char. Fix invalid memory access when calling virtcol2col() on
          an empty line.

closes: vim/vim#13321

https://github.com/vim/vim/commit/b583eda7031b1f6a3469a2537d0c10ca5fa5568e

1 files changed, 40 insertions, 0 deletions

diff --git a/test/old/testdir/test_functions.vim b/test/old/testdir/test_functions.vim
index b27b0be802..6a4d80d94d 100644
--- a/test/old/testdir/test_functions.vim
+++ b/test/old/testdir/test_functions.vim
@@ -3069,6 +3069,46 @@ func Test_getmousepos()
         \ line: 1,
         \ column: 1,
         \ }, getmousepos())
+  call Ntest_setmouse(1, 2)
+  call assert_equal(#{
+        \ screenrow: 1,
+        \ screencol: 2,
+        \ winid: win_getid(),
+        \ winrow: 1,
+        \ wincol: 2,
+        \ line: 1,
+        \ column: 1,
+        \ }, getmousepos())
+  call Ntest_setmouse(1, 8)
+  call assert_equal(#{
+        \ screenrow: 1,
+        \ screencol: 8,
+        \ winid: win_getid(),
+        \ winrow: 1,
+        \ wincol: 8,
+        \ line: 1,
+        \ column: 1,
+        \ }, getmousepos())
+  call Ntest_setmouse(1, 9)
+  call assert_equal(#{
+        \ screenrow: 1,
+        \ screencol: 9,
+        \ winid: win_getid(),
+        \ winrow: 1,
+        \ wincol: 9,
+        \ line: 1,
+        \ column: 2,
+        \ }, getmousepos())
+  call Ntest_setmouse(1, 12)
+  call assert_equal(#{
+        \ screenrow: 1,
+        \ screencol: 12,
+        \ winid: win_getid(),
+        \ winrow: 1,
+        \ wincol: 12,
+        \ line: 1,
+        \ column: 2,
+        \ }, getmousepos())
   call Ntest_setmouse(1, 25)
   call assert_equal(#{
         \ screenrow: 1,