patch 8.1.1600: cannot specify highlighting for popup window scrollbar

Problem:    Cannot specify highlighting for popup window scrollbar.
Solution:   Add "scrollbarhighlight" and "thumbhighlight" options.

src/popupwin.c

@@ -269,6 +269,26 @@ apply_move_options(win_T *wp, dict_T *d)
     get_pos_options(wp, d);
 }
 
+    static void
+check_highlight(dict_T *dict, char *name, char_u **pval)
+{
+    dictitem_T  *di;
+    char_u	*str;
+
+    di = dict_find(dict, (char_u *)name, -1);
+    if (di != NULL)
+    {
+	if (di->di_tv.v_type != VAR_STRING)
+	    semsg(_(e_invargval), name);
+	else
+	{
+	    str = tv_get_string(&di->di_tv);
+	    if (*str != NUL)
+		*pval = vim_strsave(str);
+	}
+    }
+}
+
 /*
  * Shared between popup_create() and f_popup_setoptions().
  */
@@ -375,6 +395,9 @@ apply_general_options(win_T *wp, dict_T *dict)
 	}
     }
 
+    check_highlight(dict, "scrollbarhighlight", &wp->w_scrollbar_highlight);
+    check_highlight(dict, "thumbhighlight", &wp->w_thumb_highlight);
+
     di = dict_find(dict, (char_u *)"zindex", -1);
     if (di != NULL)
     {
@@ -1677,6 +1700,11 @@ f_popup_getoptions(typval_T *argvars, typval_T *rettv)
 	dict_add_number(dict, "wrap", wp->w_p_wrap);
 	dict_add_number(dict, "drag", wp->w_popup_drag);
 	dict_add_string(dict, "highlight", wp->w_p_wcr);
+	if (wp->w_scrollbar_highlight != NULL)
+	    dict_add_string(dict, "scrollbarhighlight",
+						    wp->w_scrollbar_highlight);
+	if (wp->w_thumb_highlight != NULL)
+	    dict_add_string(dict, "thumbhighlight", wp->w_thumb_highlight);
 
 	// find the tabpage that holds this popup
 	i = 1;
@@ -2131,8 +2159,8 @@ update_popups(void (*win_update)(win_T *wp))
     int	    i;
     int	    sb_thumb_top = 0;
     int	    sb_thumb_height = 0;
-    int	    attr_scroll = highlight_attr[HLF_PSB];
+    int	    attr_scroll = 0;
-    int	    attr_thumb = highlight_attr[HLF_PST];
+    int	    attr_thumb = 0;
 
     // Find the window with the lowest zindex that hasn't been updated yet,
     // so that the window with a higher zindex is drawn later, thus goes on
@@ -2246,6 +2274,14 @@ update_popups(void (*win_update)(win_T *wp))
 	    sb_thumb_top = (wp->w_topline - 1 + (linecount / wp->w_height) / 2)
 				* (wp->w_height - sb_thumb_height)
 						  / (linecount - wp->w_height);
+	    if (wp->w_scrollbar_highlight != NULL)
+		attr_scroll = syn_name2attr(wp->w_scrollbar_highlight);
+	    else
+		attr_scroll = highlight_attr[HLF_PSB];
+	    if (wp->w_thumb_highlight != NULL)
+		attr_thumb = syn_name2attr(wp->w_thumb_highlight);
+	    else
+		attr_thumb = highlight_attr[HLF_PST];
 	}
 
 	for (i = wp->w_popup_border[0];

src/structs.h

@@ -2904,6 +2904,8 @@ struct window_S
     int		w_firstline;	    // "firstline" for popup window
     int		w_want_scrollbar;   // when zero don't use a scrollbar
     int		w_has_scrollbar;    // scrollbar displayed
+    char_u	*w_scrollbar_highlight; // "scrollbarhighlight"
+    char_u	*w_thumb_highlight; // "thumbhighlight"
     int		w_popup_padding[4]; // popup padding top/right/bot/left
     int		w_popup_border[4];  // popup border top/right/bot/left
     char_u	*w_border_highlight[4];  // popup border highlight

src/testdir/dumps/Test_popupwin_scroll_5.dump

@@ -1,10 +1,10 @@
 >1+0&#ffffff0| @73
 |2| @73
 |3| @73
-|4| @31|o+0#0000001#ffd7ff255|n|e| @4| +0#0000000#0000001| +0&#ffffff0@32
+|4| @31|o+0#0000001#ffd7ff255|n|e| @4| +0#0000000#4040ff13| +0&#ffffff0@32
-|5| @31|t+0#0000001#ffd7ff255|w|o| @4| +0#0000000#0000001| +0&#ffffff0@32
+|5| @31|t+0#0000001#ffd7ff255|w|o| @4| +0#0000000#4040ff13| +0&#ffffff0@32
-|6| @31|t+0#0000001#ffd7ff255|h|r|e@1| @2| +0#0000000#a8a8a8255| +0&#ffffff0@32
+|6| @31|t+0#0000001#ffd7ff255|h|r|e@1| @2| +0#0000000#ff404010| +0&#ffffff0@32
-|7| @31|f+0#0000001#ffd7ff255|o|u|r| @3| +0#0000000#a8a8a8255| +0&#ffffff0@32
+|7| @31|f+0#0000001#ffd7ff255|o|u|r| @3| +0#0000000#ff404010| +0&#ffffff0@32
 |8| @73
 |9| @73
 |:|c|a|l@1| |S|c|r|o|l@1|U|p|(|)| @40|1|,|1| @10|T|o|p| 

src/testdir/dumps/Test_popupwin_scroll_6.dump

@@ -1,10 +1,10 @@
 >1+0&#ffffff0| @73
 |2| @73
 |3| @73
-|4| @31|t+0#0000001#ffd7ff255|h|r|e@1| @2| +0#0000000#a8a8a8255| +0&#ffffff0@32
+|4| @31|t+0#0000001#ffd7ff255|h|r|e@1| @2| +0#0000000#ff404010| +0&#ffffff0@32
-|5| @31|f+0#0000001#ffd7ff255|o|u|r| @3| +0#0000000#0000001| +0&#ffffff0@32
+|5| @31|f+0#0000001#ffd7ff255|o|u|r| @3| +0#0000000#4040ff13| +0&#ffffff0@32
-|6| @31|f+0#0000001#ffd7ff255|i|v|e| @3| +0#0000000#0000001| +0&#ffffff0@32
+|6| @31|f+0#0000001#ffd7ff255|i|v|e| @3| +0#0000000#4040ff13| +0&#ffffff0@32
-|7| @31|s+0#0000001#ffd7ff255|i|x| @4| +0#0000000#a8a8a8255| +0&#ffffff0@32
+|7| @31|s+0#0000001#ffd7ff255|i|x| @4| +0#0000000#ff404010| +0&#ffffff0@32
 |8| @73
 |9| @73
 |:|c|a|l@1| |S|c|r|o|l@1|D|o|w|n|(|)| @38|1|,|1| @10|T|o|p| 

src/testdir/dumps/Test_popupwin_scroll_7.dump

@@ -1,10 +1,10 @@
 >1+0&#ffffff0| @73
 |2| @73
 |3| @73
-|4| @31|s+0#0000001#ffd7ff255|i|x| @4| +0#0000000#a8a8a8255| +0&#ffffff0@32
+|4| @31|s+0#0000001#ffd7ff255|i|x| @4| +0#0000000#ff404010| +0&#ffffff0@32
-|5| @31|s+0#0000001#ffd7ff255|e|v|e|n| @2| +0#0000000#a8a8a8255| +0&#ffffff0@32
+|5| @31|s+0#0000001#ffd7ff255|e|v|e|n| @2| +0#0000000#ff404010| +0&#ffffff0@32
-|6| @31|e+0#0000001#ffd7ff255|i|g|h|t| @2| +0#0000000#0000001| +0&#ffffff0@32
+|6| @31|e+0#0000001#ffd7ff255|i|g|h|t| @2| +0#0000000#4040ff13| +0&#ffffff0@32
-|7| @31|n+0#0000001#ffd7ff255|i|n|e| @3| +0#0000000#0000001| +0&#ffffff0@32
+|7| @31|n+0#0000001#ffd7ff255|i|n|e| @3| +0#0000000#4040ff13| +0&#ffffff0@32
 |8| @73
 |9| @73
 |:|c|a|l@1| |S|c|r|o|l@1|D|o|w|n|(|)| @38|1|,|1| @10|T|o|p| 

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1600,
 /**/
     1599,
 /**/

src/window.c

@@ -4857,6 +4857,8 @@ win_free(
     free_callback(&wp->w_filter_cb);
     for (i = 0; i < 4; ++i)
 	VIM_CLEAR(wp->w_border_highlight[i]);
+    vim_free(wp->w_scrollbar_highlight);
+    vim_free(wp->w_thumb_highlight);
     vim_free(wp->w_popup_title);
     list_unref(wp->w_popup_mask);
 #endif