Fullwidth sign characters, misaligned colorcolumn, and missing visual highlighting

Hello!

Under certain circumstances the colorcolumn becomes misaligned by one character:

1. A lign has a sign whose text is a fullwidth character.
2. The colorcolumn is a column after the end of the text on the line.

In those circumstances the colorcolumn is drawn at column n-1 instead of n.

Here's how to reproduce:

1. Define a sign whose text is a fullwidth character (e.g. U+FF0B fullwidth plus sign):

:sign define foo text=＋

2. Open a file in vim.

3. Place the sign somewhere:

:sign place 1 name=foo line=5 buffer=1

4. Set the colorcolumn to a number greater than the last colum of the line with the sign:

:set cc=20

5a. Expected: the colorcolumn is drawn at column 20.
5b. Actual: the colorcolumn is drawn at column 19.

Furthermore, the line with the sign is no longer highlighted in a visual selection. To reproduce (following on from above):

6. Go to line 4, switch to visual line mode, and select a few lines encompassing the line with the sign:

4GV2j

7a. Expected: lines 4-6 are highlighted.
7b. Actual: line 5 isn't.

Can anyone shed any light on all this?

Many thanks,

Andrew Stewart

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