Problem: missing winid argument for virtcol()
Solution: Add a {winid} argument to virtcol()
Other functions col(), charcol() and virtcol2col() support a {winid}
argument, so it makes sense for virtcol() to also support than.
Also add test for virtcol2col() with 'showbreak' and {winid}.
closes: #12633
Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
825cf813fa
