diff --git a/src/ops.c b/src/ops.c
index e9cfb1d..e35b033 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -629,26 +629,9 @@ block_insert(
#ifdef FEAT_MBYTE
if (has_mbyte && spaces > 0)
- {
- int off;
+ // avoid copying part of a multi-byte character
+ offset -= (*mb_head_off)(oldp, oldp + offset);
- /* Avoid starting halfway a multi-byte character. */
- if (b_insert)
- {
- off = (*mb_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 = (*mb_head_off)(oldp, oldp + offset);
- offset -= off;
- }
- spaces -= off;
- count -= off;
- }
#endif
// Make sure the allocated size matches what is actually copied below.
diff --git a/src/testdir/test_utf8.vim b/src/testdir/test_utf8.vim
index 24e3db8..1042720 100644
--- a/src/testdir/test_utf8.vim
+++ b/src/testdir/test_utf8.vim
@@ -9,7 +9,7 @@ func Test_visual_block_insert()
new
call setline(1, ["aaa", "あああ", "bbb"])
exe ":norm! gg0l\<C-V>jjIx\<Esc>"
- call assert_equal(['axaa', 'xあああ', 'bxbb'], getline(1, '$'))
+ call assert_equal(['axaa', ' xあああ', 'bxbb'], getline(1, '$'))
bwipeout!
endfunc