[gtk/fix-icontheme-invalidation: 4/5] widget: Update when font settings change

[Matthias Clasen <matthiasc src gnome org>]

commit e45cd874eb15dc250a141cd4d0f9210f794dd6ba
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Apr 21 16:26:36 2020 -0400

    widget: Update when font settings change
    
    Update the pango context when font-related settings
    change, using the new GtkSystemSetting mechanism.

 gtk/gtkwidget.c | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 8d8d3d366b..6b0b80a50d 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -4874,6 +4874,15 @@ gtk_widget_real_system_setting_changed (GtkWidget        *widget,
 {
   GtkWidget *child;
 
+  if (setting == GTK_SYSTEM_SETTING_DPI ||
+      setting == GTK_SYSTEM_SETTING_FONT_NAME ||
+      setting == GTK_SYSTEM_SETTING_FONT_CONFIG)
+    {
+      gtk_widget_update_pango_context (widget);
+      if (gtk_widget_peek_pango_context (widget))
+        gtk_widget_queue_resize (widget);
+    }
+
   for (child = _gtk_widget_get_first_child (widget);
        child != NULL;
        child = _gtk_widget_get_next_sibling (child))