patch 9.1.0047: issues with temp curwin/buf while cmdwin is open

Problem:  Things that temporarily change/restore curwin/buf (e.g:
          win_execute, some autocmds) may break assumptions that
          curwin/buf is the cmdwin when "cmdwin_type != 0", causing
          issues.

Solution: Expose the cmdwin's real win/buf and check that instead. Also
          try to ensure these variables are NULL if "cmdwin_type == 0",
          allowing them to be used directly in most cases without
          checking cmdwin_type. (Sean Dewar)

Alternatively, we could ban win_execute in the cmdwin and audit all places that
temporarily change/restore curwin/buf, but I didn't notice any problems arising
from allowing this (standard cmdwin restrictions still apply, so things that may
actually break the cmdwin are still forbidden).

closes: #12819

Signed-off-by: Sean Dewar <seandewar@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/move.c b/src/move.c
index 861d84b..5d2fece 100644
--- a/src/move.c
+++ b/src/move.c
@@ -1067,7 +1067,7 @@
 win_col_off(win_T *wp)
 {
     return (((wp->w_p_nu || wp->w_p_rnu) ? number_width(wp) + 1 : 0)
-	    + (cmdwin_type == 0 || wp != curwin ? 0 : 1)
+	    + (wp != cmdwin_win ? 0 : 1)
 #ifdef FEAT_FOLDING
 	    + wp->w_p_fdc
 #endif