st: Remove support for fixed positioning in BoxLayout

It is the job of layout containers to arrange their children; having
a hidden feature that *also* allows children to be positioned freely
outside the parent's allocation is just odd.
With the last user of the feature gone, kill it.

https://bugzilla.gnome.org/show_bug.cgi?id=703808

src/st/st-box-layout.c

@@ -285,7 +285,6 @@ get_content_preferred_width (StBoxLayout *self,
 {
   StBoxLayoutPrivate *priv = self->priv;
   gint n_children = 0;
-  gint n_fixed = 0;
   gfloat min_width, natural_width;
   ClutterActor *child;
 
@@ -304,12 +303,6 @@ get_content_preferred_width (StBoxLayout *self,
 
       n_children++;
 
-      if (clutter_actor_get_fixed_position_set (child))
-        {
-          n_fixed++;
-          continue;
-        }
-
       if (priv->is_vertical)
         {
           _st_actor_get_preferred_width (child, -1, FALSE,
@@ -329,10 +322,10 @@ get_content_preferred_width (StBoxLayout *self,
         }
     }
 
-  if (!priv->is_vertical && (n_children - n_fixed) > 1)
+  if (!priv->is_vertical && n_children > 1)
     {
-      min_width += priv->spacing * (n_children - n_fixed - 1);
+      min_width += priv->spacing * (n_children - 1);
-      natural_width += priv->spacing * (n_children - n_fixed - 1);
+      natural_width += priv->spacing * (n_children - 1);
     }
 
   if (min_width_p)
@@ -367,7 +360,6 @@ get_content_preferred_height (StBoxLayout *self,
 {
   StBoxLayoutPrivate *priv = self->priv;
   gint n_children = 0;
-  gint n_fixed = 0;
   gfloat min_height, natural_height;
   ClutterActor *child;
 
@@ -386,12 +378,6 @@ get_content_preferred_height (StBoxLayout *self,
 
       n_children++;
 
-      if (clutter_actor_get_fixed_position_set (child))
-        {
-          n_fixed++;
-          continue;
-        }
-
       if (priv->is_vertical)
         {
           clutter_container_child_get ((ClutterContainer*) self, child,
@@ -416,10 +402,10 @@ get_content_preferred_height (StBoxLayout *self,
         }
     }
 
-  if (priv->is_vertical && (n_children - n_fixed) > 1)
+  if (priv->is_vertical && n_children > 1)
     {
-      min_height += priv->spacing * (n_children - n_fixed - 1);
+      min_height += priv->spacing * (n_children - 1);
-      natural_height += priv->spacing * (n_children - n_fixed - 1);
+      natural_height += priv->spacing * (n_children - 1);
     }
 
   if (min_height_p)
@@ -511,12 +497,9 @@ compute_shrinks (StBoxLayout *self,
     {
       gfloat child_min, child_nat;
       gboolean child_fill;
-      gboolean fixed;
-
-      fixed = clutter_actor_get_fixed_position_set (child);
 
       shrinks[i].child_index = i;
-      if (CLUTTER_ACTOR_IS_VISIBLE (child) && !fixed)
+      if (CLUTTER_ACTOR_IS_VISIBLE (child))
         {
           if (priv->is_vertical)
             {
@@ -738,20 +721,13 @@ st_box_layout_allocate (ClutterActor          *actor,
     {
       ClutterActorBox child_box;
       gfloat child_min, child_nat, child_allocated;
-      gboolean xfill, yfill, expand, fixed;
+      gboolean xfill, yfill, expand;
       StAlign xalign, yalign;
       gdouble xalign_f, yalign_f;
 
       if (!CLUTTER_ACTOR_IS_VISIBLE (child))
         goto next_child;
 
-      fixed = clutter_actor_get_fixed_position_set (child);
-      if (fixed)
-        {
-          clutter_actor_allocate_preferred_size (child, flags);
-          goto next_child;
-        }
-
       clutter_container_child_get ((ClutterContainer*) actor, child,
                                    "x-fill", &xfill,
                                    "y-fill", &yfill,

tests/interactive/box-layout.js

@@ -45,12 +45,6 @@ function test() {
                                      style: 'border: 1px solid #aaaaaa; '
                                      + 'background: #cceeff' }));
 
-    b2.add(new St.Label({ x: 50,
-                          y: 50,
-                          text: "Fixed",
-                          style: 'border: 1px solid #aaaaaa;'
-                          + 'background: #ffffcc' }));
-
     ////////////////////////////////////////////////////////////////////////////////
 
     function createCollapsableBox(width) {