widget: Make gtk_widget_queue_allocate() not resize

This commit toggles the big switch. We now don't run size_allocate()
from the toplevel up anymore in cases where we don't need to.

Things might be broken in subtle ways as a result of this commit. We'll
have to find them and fix them.

gtk/gtkcontainer.c

@@ -2144,6 +2144,8 @@ gtk_container_real_check_resize (GtkContainer *container)
   GtkRequisition requisition;
   int baseline;
 
+  if (_gtk_widget_get_alloc_needed (widget))
+    {
       gtk_widget_get_preferred_size (widget, &requisition, NULL);
       gtk_widget_get_allocated_size (widget, &allocation, &baseline);
 
@@ -2164,6 +2166,11 @@ gtk_container_real_check_resize (GtkContainer *container)
           gtk_widget_size_allocate_with_baseline (widget, &allocation, baseline);
         }
     }
+  else
+    {
+      gtk_widget_ensure_allocate (widget);
+    }
+}
 
 /* The container hasn't changed size but one of its children
  *  queued a resize request. Which means that the allocation

gtk/gtkwidget.c

@@ -5577,6 +5577,8 @@ gtk_widget_queue_draw (GtkWidget *widget)
                                 0, 0, rect.width, rect.height);
 }
 
+static void
+gtk_widget_set_alloc_needed (GtkWidget *widget);
 /**
  * gtk_widget_queue_allocate:
  * @widget: a #GtkWidget
@@ -5595,8 +5597,7 @@ gtk_widget_queue_allocate (GtkWidget *widget)
 {
   g_return_if_fail (GTK_IS_WIDGET (widget));
 
-  /* for now... */
-  gtk_widget_queue_resize (widget);
+  gtk_widget_set_alloc_needed (widget);
 }
 
 /**
@@ -6085,6 +6086,9 @@ gtk_widget_size_allocate_with_baseline (GtkWidget     *widget,
     }
 
 out:
+  if (priv->alloc_needed_on_child)
+    gtk_widget_ensure_allocate (widget);
+
   gtk_widget_pop_verify_invariants (widget);
 }
 
@@ -16234,6 +16238,14 @@ gtk_widget_set_alloc_needed (GtkWidget *widget)
       if (!priv->visible)
         break;
 
+G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
+      if (GTK_IS_RESIZE_CONTAINER (widget))
+        {
+          gtk_container_queue_resize_handler (GTK_CONTAINER (widget));
+          break;
+        }
+G_GNUC_END_IGNORE_DEPRECATIONS;
+
       widget = priv->parent;
       if (widget == NULL)
         break;
@@ -16243,6 +16255,40 @@ gtk_widget_set_alloc_needed (GtkWidget *widget)
   while (TRUE);
 }
 
+void
+gtk_widget_ensure_allocate (GtkWidget *widget)
+{
+  GtkWidgetPrivate *priv = widget->priv;
+
+  gtk_widget_ensure_resize (widget);
+
+  if (!priv->visible || !priv->child_visible)
+    return;
+
+  /*  This code assumes that we only reach here if the previous
+   *  allocation is still valid (ie no resize was queued).
+   *  If that wasn't true, the parent would have taken care of
+   *  things.
+   */
+  if (priv->alloc_needed)
+    {
+      GtkAllocation allocation;
+      int baseline;
+
+      gtk_widget_get_allocated_size (widget, &allocation, &baseline);
+      gtk_widget_size_allocate_with_baseline (widget, &allocation, baseline);
+    }
+  else if (priv->alloc_needed_on_child)
+    {
+      priv->alloc_needed_on_child = FALSE;
+
+      if (GTK_IS_CONTAINER (widget))
+        gtk_container_foreach (GTK_CONTAINER (widget),
+                               (GtkCallback) gtk_widget_ensure_allocate,
+                               NULL);
+    }
+}
+
 void
 gtk_widget_queue_resize_on_widget (GtkWidget *widget)
 {

gtk/gtkwidgetprivate.h

@@ -169,6 +169,7 @@ void         _gtk_widget_set_shadowed       (GtkWidget *widget,
 gboolean     _gtk_widget_get_alloc_needed   (GtkWidget *widget);
 void         gtk_widget_queue_resize_on_widget (GtkWidget *widget);
 void         gtk_widget_ensure_resize       (GtkWidget *widget);
+void         gtk_widget_ensure_allocate     (GtkWidget *widget);
 void         _gtk_widget_draw               (GtkWidget *widget,
 					     cairo_t   *cr);
 void          _gtk_widget_scale_changed     (GtkWidget *widget);

gtk/gtkwindow.c

@@ -8247,6 +8247,8 @@ gtk_window_check_resize (GtkContainer *container)
    * so handle it like a normal window */
   if (!_gtk_widget_is_toplevel (GTK_WIDGET (container)))
     GTK_CONTAINER_CLASS (gtk_window_parent_class)->check_resize (container);
+  else if (!_gtk_widget_get_alloc_needed (GTK_WIDGET (container)))
+    GTK_CONTAINER_CLASS (gtk_window_parent_class)->check_resize (container);
   else if (gtk_widget_get_visible (GTK_WIDGET (container)))
     gtk_window_move_resize (GTK_WINDOW (container));
 }