patch 8.2.3950: going beyond the end of the line with /\%V

Problem:    Going beyond the end of the line with /\%V.
Solution:   Check for valid column in getvcol().
diff --git a/src/testdir/test_regexp_latin.vim b/src/testdir/test_regexp_latin.vim
index 03efdbe..f936549 100644
--- a/src/testdir/test_regexp_latin.vim
+++ b/src/testdir/test_regexp_latin.vim
@@ -1053,4 +1053,12 @@
   bwipe!
 endfunc
 
+func Test_using_invalid_visual_position()
+  " this was going beyond the end of the line
+  new
+  exe "norm 0o000\<Esc>0\<C-V>$s0"
+  /\%V
+  bwipe!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab