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diff --git a/src/ops.c b/src/ops.c
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index 88992b6..80e0ea1 100644
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--- a/src/ops.c
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+++ b/src/ops.c
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@@ -527,24 +527,8 @@ block_insert(
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}
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if (has_mbyte && spaces > 0)
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- {
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- int off;
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-
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- // Avoid starting halfway a multi-byte character.
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- if (b_insert)
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- {
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- off = (*mb_head_off)(oldp, oldp + offset + spaces);
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- spaces -= off;
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- count -= off;
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- }
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- else
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- {
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- // spaces fill the gap, the character that's at the edge moves
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- // right
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- off = (*mb_head_off)(oldp, oldp + offset);
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- offset -= off;
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- }
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- }
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+ // avoid copying part of a multi-byte character
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+ offset -= (*mb_head_off)(oldp, oldp + offset);
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// Make sure the allocated size matches what is actually copied below.
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newp = alloc(STRLEN(oldp) + spaces + s_len
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diff --git a/src/testdir/test_utf8.vim b/src/testdir/test_utf8.vim
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index 5454e43..bedec20 100644
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--- a/src/testdir/test_utf8.vim
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+++ b/src/testdir/test_utf8.vim
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@@ -7,7 +7,7 @@ func Test_visual_block_insert()
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new
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call setline(1, ["aaa", "あああ", "bbb"])
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exe ":norm! gg0l\<C-V>jjIx\<Esc>"
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- call assert_equal(['axaa', 'xあああ', 'bxbb'], getline(1, '$'))
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+ call assert_equal(['axaa', ' xあああ', 'bxbb'], getline(1, '$'))
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bwipeout!
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endfunc
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diff --git a/src/testdir/test_visual.vim b/src/testdir/test_visual.vim
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index dc8e376..8de9e3d 100644
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--- a/src/testdir/test_visual.vim
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+++ b/src/testdir/test_visual.vim
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@@ -976,4 +976,13 @@ func Test_visual_block_append_invalid_char()
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bwipe!
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endfunc
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+func Test_visual_block_insert_round_off()
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+ new
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+ " The number of characters are tuned to fill a 4096 byte allocated block,
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+ " so that valgrind reports going over the end.
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+ call setline(1, ['xxxxx', repeat('0', 1350), "\t", repeat('x', 60)])
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+ exe "normal gg0\<C-V>GI" .. repeat('0', 1320) .. "\<Esc>"
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+ bwipe!
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+endfunc
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+
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" vim: shiftwidth=2 sts=2 expandtab
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