text: React to text attribute changes in css

Recompute the layout when the css style change
affects text attributes. This matches what we do
in GtkLabel, and without this, changing the
font-features-setting css property in the Inspector
does not have immediate effect.

gtk/gtktext.c

@@ -3488,11 +3488,13 @@ gtk_text_css_changed (GtkWidget         *widget,
 
   gtk_text_update_cached_style_values (self);
 
-  if (change == NULL ||
-      gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_TEXT |
+  if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_TEXT |
                                             GTK_CSS_AFFECTS_BACKGROUND |
                                             GTK_CSS_AFFECTS_CONTENT))
-    gtk_widget_queue_draw (GTK_WIDGET (self));
+    gtk_widget_queue_draw (widget);
+
+  if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_TEXT_ATTRS))
+    gtk_text_recompute (self);
 }
 
 static void