vim-patch:8.2.4151: reading beyond the end of a line

Problem:    Reading beyond the end of a line.
Solution:   For block insert only use the offset for correcting the length.
https://github.com/vim/vim/commit/57df9e8a9f9ae1aafdde9b86b10ad907627a87dc

1 files changed, 2 insertions, 13 deletions

diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index e712aa18b3..c9a99fef84 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -568,19 +568,8 @@ static void block_insert(oparg_T *oap, char_u *s, int b_insert, struct block_def
     }
 
     if (spaces > 0) {
-      int off;
-
-      // Avoid starting halfway through a multi-byte character.
-      if (b_insert) {
-        off = utf_head_off(oldp, oldp + offset + spaces);
-        spaces -= off;
-        count -= off;
-      } else {
-        // spaces fill the gap, the character that's at the edge moves
-        // right
-        off = utf_head_off(oldp, oldp + offset);
-        offset -= off;
-      }
+      // avoid copying part of a multi-byte character
+      offset -= utf_head_off(oldp, oldp + offset);
     }
     if (spaces < 0) {  // can happen when the cursor was moved
       spaces = 0;