Browsers with use default colours set only get redrawn by choices when the...

Browsers with use default colours set only get redrawn by choices when the default colours have actually been changed.

c/Choices

@@ -756,10 +756,11 @@ static _kernel_oserror * choices_get_contents(void)
   char                    * tempstring;
   int                       reqsize;
   fm_typeface             * tfptr;
-  int                       serif_changed = 0;
-  int                       sans_changed  = 0;
-  int                       fixed_changed = 0;
-  int                       needs_redraw  = 0;
+  int                       serif_changed   = 0;
+  int                       sans_changed    = 0;
+  int                       fixed_changed   = 0;
+  int                       needs_redraw    = 0;
+  int                       colours_changed = 0;
   int                       old_font_size, old_system_font, frac;
   int                       temp;
 
@@ -911,6 +912,20 @@ static _kernel_oserror * choices_get_contents(void)
     if (choices.tt_aspect != new_choices->tt_aspect) fixed_changed = 1;
   }
 
+  /* Have the default document colours changed? */
+
+  if (
+      choices.background_colour != new_choices->background_colour ||
+      choices.text_colour       != new_choices->text_colour       ||
+      choices.link_colour       != new_choices->link_colour       ||
+      choices.used_colour       != new_choices->used_colour       ||
+      choices.followed_colour   != new_choices->followed_colour   ||
+      choices.selected_colour   != new_choices->selected_colour
+     )
+  {
+    colours_changed = 1;
+  }
+
   /* Do we need to redraw because certain special items have changed? */
 
   if (
@@ -1014,7 +1029,9 @@ static _kernel_oserror * choices_get_contents(void)
       if (
            needs_redraw ||
            (
-             !b->use_source_cols ||
+             (!b->use_source_cols &&
+              colours_changed
+             ) ||
              (
                b->background_colour == -1 &&
                b->background_image  == -1