[gtk+] widget: Properly invalidate when CSS font properties change.

[Benjamin Otte <otte src gnome org>]

commit 065aa296ed4908dff896818e9859258ab9ed9e02
Author: Benjamin Otte <otte redhat com>
Date:   Wed Jan 20 02:17:32 2016 +0100

    widget: Properly invalidate when CSS font properties change.

 gtk/gtkwidget.c |   41 +++++++++++++++++++++++++----------------
 1 files changed, 25 insertions(+), 16 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 2d9fd7f..ba85df6 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -8112,30 +8112,22 @@ gtk_widget_real_style_updated (GtkWidget *widget)
 {
   GtkWidgetPrivate *priv = widget->priv;
 
-  gtk_widget_update_pango_context (widget);
   gtk_widget_update_alpha (widget);
 
-  G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
-  if (priv->style != NULL &&
-      priv->style != gtk_widget_get_default_style ())
-    {
-      /* Trigger ::style-set for old
-       * widgets not listening to this
-       */
-      g_signal_emit (widget,
-                     widget_signals[STYLE_SET],
-                     0,
-                     widget->priv->style);
-    }
-  G_GNUC_END_IGNORE_DEPRECATIONS;
-
   if (widget->priv->context)
     {
       GtkCssStyleChange *change = gtk_style_context_get_change (widget->priv->context);
+      gboolean has_text = gtk_widget_peek_pango_context (widget) != NULL;
+
+      if (change == NULL ||
+          (has_text && gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_FONT)))
+        gtk_widget_update_pango_context (widget);
 
       if (widget->priv->anchored)
         {
-          if (change == NULL || gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_SIZE))
+          if (change == NULL ||
+              gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_SIZE) ||
+              (has_text && gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_TEXT)))
             gtk_widget_queue_resize (widget);
           else if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_CLIP))
             gtk_widget_queue_allocate (widget);
@@ -8145,9 +8137,26 @@ gtk_widget_real_style_updated (GtkWidget *widget)
     }
   else
     {
+      gtk_widget_update_pango_context (widget);
+
       if (widget->priv->anchored)
         gtk_widget_queue_resize (widget);
     }
+
+  G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
+  if (priv->style != NULL &&
+      priv->style != gtk_widget_get_default_style ())
+    {
+      /* Trigger ::style-set for old
+       * widgets not listening to this
+       */
+      g_signal_emit (widget,
+                     widget_signals[STYLE_SET],
+                     0,
+                     widget->priv->style);
+    }
+  G_GNUC_END_IGNORE_DEPRECATIONS;
+
 }
 
 static gboolean