Problem: The default fold column, as well as the 'statuscolumn', were
drawn unnecessarily/unexpectedly for virtual lines placed
with `virt_lines_leftcol` set.
Solution: Skip the column states if a virtual line with
`virt_lines_leftcol` set will be drawn.
Problem: The `'statuscolumn'` was not re-evaluated for wrapped lines,
when preceded by virtual/filler lines. There was also no way
to distinguish virtual and wrapped lines in the status column.
Solution: Make sure to rebuild the statuscolumn, and replace variable
`v:wrap` with `v:virtnum`. `v:virtnum` is negative when drawing
virtual lines, zero when drawing the actual buffer line, and
positive when drawing the wrapped part of a buffer line.
fix(statuscolumn): statusline click registered as statuscolumn
Problem: Status line click is registered as status status column click.
Solution: Check that mouse is not on the status line.
Resolve https://github.com/luukvbaal/statuscol.nvim/issues/4.
test(statuscolumn): add more tests more wrapped lines
Also initialize a "relnum" variable to suppress a Coverity warning.
The uninitialized value wasn't actually used by build_statuscol_str().
Problem: Unable to customize the column next to a window ('gutter').
Solution: Add 'statuscolumn' option that follows the 'statusline' syntax,
allowing to customize the status column. Also supporting the %@
click execute function label. Adds new items @C and @s which
will print the fold and sign columns. Line numbers and signs
can be clicked, highlighted, aligned, transformed, margined etc.
