vim-patch:9.0.1728: missing winid argument for virtcol() (#24770)

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: vim/vim#12633

825cf813fa

runtime/lua/vim/_meta/vimfn.lua

@@ -10013,10 +10013,13 @@ function vim.fn.values(dict) end
 ---       returns the cursor position.  Differs from |'<| in
 ---       that it's updated right away.
 ---
---- If {list} is present and non-zero then virtcol() returns a List
---- with the first and last screen position occupied by the
+--- If {list} is present and non-zero then virtcol() returns a
+--- List with the first and last screen position occupied by the
 --- character.
 ---
+--- With the optional {winid} argument the values are obtained for
+--- that window instead of the current window.
+---
 --- Note that only marks in the current file can be used.
 --- Examples: >vim
 ---   " With text "foo^Lbar" and cursor on the "^L":
@@ -10028,15 +10031,16 @@ function vim.fn.values(dict) end
 ---   " With text "    there", with 't at 'h':
 ---
 ---   echo virtcol("'t")  " returns 6
---- <Techo he first column is 1.  0 is returned for an error.
---- A echo more advanced example that echoes the maximum length of
+--- <The first column is 1.  0 or [0, 0] is returned for an error.
+--- A more advanced example that echoes the maximum length of
 --- all lines: >vim
 ---     echo max(map(range(1, line('$')), "virtcol([v:val, '$'])"))
 ---
 --- @param expr any
 --- @param list? any
+--- @param winid? integer
 --- @return any
-function vim.fn.virtcol(expr, list) end
+function vim.fn.virtcol(expr, list, winid) end
 
 --- The result is a Number, which is the byte index of the
 --- character in window {winid} at buffer line {lnum} and virtual