[libdazzle] multi-paned: use gtk_widget_compute_expand()

[Christian Hergert <chergert src gnome org>]

commit f36a2698cb85c3f0af7712660569320c6dbdc71f
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jun 22 03:50:40 2017 -0700

    multi-paned: use gtk_widget_compute_expand()
    
    We don't want to be using the widget-only flags for this, but instead the
    computed version that checks the children.

 src/widgets/dzl-multi-paned.c |   30 ++++++++----------------------
 1 files changed, 8 insertions(+), 22 deletions(-)
---
diff --git a/src/widgets/dzl-multi-paned.c b/src/widgets/dzl-multi-paned.c
index b8c6797..3d8ed40 100644
--- a/src/widgets/dzl-multi-paned.c
+++ b/src/widgets/dzl-multi-paned.c
@@ -1298,14 +1298,11 @@ allocation_stage_expand (DzlMultiPaned   *self,
        * allocation stages in this case.
        */
 
-      if (IS_HORIZONTAL (state->orientation))
+      if (gtk_widget_compute_expand (child->widget, state->orientation))
         {
-          if (gtk_widget_get_hexpand (child->widget))
+          if (IS_HORIZONTAL (state->orientation))
             child->alloc.width = state->top_alloc.width;
-        }
-      else
-        {
-          if (gtk_widget_get_vexpand (child->widget))
+          else
             child->alloc.height = state->top_alloc.height;
         }
 
@@ -1329,16 +1326,8 @@ allocation_stage_expand (DzlMultiPaned   *self,
 
       if (!child->position_set)
         {
-          if (IS_HORIZONTAL (state->orientation))
-            {
-              if (gtk_widget_get_hexpand (child->widget))
-                g_ptr_array_add (expanding, child);
-            }
-          else
-            {
-              if (gtk_widget_get_vexpand (child->widget))
-                g_ptr_array_add (expanding, child);
-            }
+          if (gtk_widget_compute_expand (child->widget, state->orientation))
+            g_ptr_array_add (expanding, child);
         }
     }
 
@@ -1422,18 +1411,15 @@ allocation_stage_expand (DzlMultiPaned   *self,
 
       if (!child->position_set)
         {
-          if (IS_HORIZONTAL (state->orientation))
+          if (gtk_widget_compute_expand (child->widget, state->orientation))
             {
-              if (gtk_widget_get_hexpand (child->widget))
+              if (IS_HORIZONTAL (state->orientation))
                 {
                   child->alloc.width += adjust;
                   state->avail_width -= adjust;
                   x_adjust += adjust;
                 }
-            }
-          else
-            {
-              if (gtk_widget_get_vexpand (child->widget))
+              else
                 {
                   child->alloc.height += adjust;
                   state->avail_height -= adjust;