syntax: 'cursorcolumn', 'colorcolumn': low priority neovim#6380

runtime/doc/options.txt

@@ -6747,19 +6747,19 @@ A jump table for the options with a short description can be found at |Q_op|.
 						*'winhighlight'* *'winhl'*
 'winhighlight' 'winhl'	string (default empty)
 			local to window
-	Window-local highlights.  Comma-delimited list of |group-name| pairs
-	"{hl-builtin}:{hl-group},..." where each {hl-builtin} is a group (from
-	|highlight-groups|) to be overridden by {hl-group} in the window where
-	this option was set.  Only builting ui highlights are supported, not
-	syntax highlighting.  For that purpose, use |:ownsyntax|.
+	Window-local highlights.  Comma-delimited list of highlight
+	|group-name| pairs "{hl-builtin}:{hl},..." where each {hl-builtin} is
+	a built-in |highlight-groups| item to be overridden by {hl} group in
+	the window.  Only built-in |highlight-groups| are supported, not
+	syntax highlighting (use |:ownsyntax| for that).
 
-	Most highlights occuring within the frame of a window are supported.
 	Highlights of vertical separators are determined by the window to the
 	left of the separator.  The highlight of a tabpage in |tabline| is
-	determined by the last focused window in the tabpage.  Highlights of
+	determine by the last-focused window of the tabpage.  Highlights of
 	the popupmenu are determined by the current window.  Highlights in the
-	message area are not overridable.  Example for overriding the
-	backgrond color: >
+	message area cannot be overridden.
+
+	Example: show a different color for non-current windows: >
 		set winhighlight=Normal:MyNormal,NormalNC:MyNormalNC
 <
 			*'winfixheight'* *'wfh'* *'nowinfixheight'* *'nowfh'*

runtime/doc/vim_diff.txt

@@ -280,6 +280,10 @@ other arguments if used).
 
 |input()| and |inputdialog()| support user-defined cmdline highlighting.
 
+Highlight groups:
+  |hl-ColorColumn|, |hl-CursorColumn| are lower priority than most other
+  groups
+
 ==============================================================================
 5. Missing legacy features				 *nvim-features-missing*
 

src/nvim/screen.c

@@ -2201,16 +2201,16 @@ win_line (
   int change_end = -1;                  /* last col of changed area */
   colnr_T trailcol = MAXCOL;            /* start of trailing spaces */
   int need_showbreak = false;           // overlong line, skip first x chars
-  int line_attr = 0;                    /* attribute for the whole line */
-  matchitem_T *cur;                     /* points to the match list */
-  match_T     *shl;                     /* points to search_hl or a match */
-  int shl_flag;                         /* flag to indicate whether search_hl
-                                           has been processed or not */
-  int prevcol_hl_flag;                  /* flag to indicate whether prevcol
-                                           equals startcol of search_hl or one
-                                           of the matches */
-  int prev_c = 0;                       /* previous Arabic character */
-  int prev_c1 = 0;                      /* first composing char for prev_c */
+  int line_attr = 0;                    // attribute for the whole line
+  matchitem_T *cur;                     // points to the match list
+  match_T     *shl;                     // points to search_hl or a match
+  int shl_flag;                         // flag to indicate whether search_hl
+                                        // has been processed or not
+  int prevcol_hl_flag;                  // flag to indicate whether prevcol
+                                        // equals startcol of search_hl or one
+                                        // of the matches
+  int prev_c = 0;                       // previous Arabic character
+  int prev_c1 = 0;                      // first composing char for prev_c
   int did_line_attr = 0;
 
   bool search_attr_from_match = false;  // if search_attr is from :match
@@ -3594,15 +3594,13 @@ win_line (
                    && lcs_eol_one > 0) {
           // Display a '$' after the line or highlight an extra
           // character if the line break is included.
-          // For a diff line the highlighting continues after the
-          // "$".
+          // For a diff line the highlighting continues after the "$".
           if (diff_hlf == (hlf_T)0 && line_attr == 0) {
-            /* In virtualedit, visual selections may extend
-             * beyond end of line. */
+            // In virtualedit, visual selections may extend beyond end of line.
             if (area_highlighting && virtual_active()
-                && tocol != MAXCOL && vcol < tocol)
+                && tocol != MAXCOL && vcol < tocol) {
               n_extra = 0;
-            else {
+            } else {
               p_extra = at_end_str;
               n_extra = 1;
               c_extra = NUL;
@@ -4035,10 +4033,10 @@ win_line (
       if (wp->w_p_cuc && VCOL_HLC == (long)wp->w_virtcol
           && lnum != wp->w_cursor.lnum) {
         vcol_save_attr = char_attr;
-        char_attr = hl_combine_attr(char_attr, win_hl_attr(wp, HLF_CUC));
+        char_attr = hl_combine_attr(win_hl_attr(wp, HLF_CUC), char_attr);
       } else if (draw_color_col && VCOL_HLC == *color_cols) {
         vcol_save_attr = char_attr;
-        char_attr = hl_combine_attr(char_attr, win_hl_attr(wp, HLF_MC));
+        char_attr = hl_combine_attr(win_hl_attr(wp, HLF_MC), char_attr);
       }
     }