Snowflake layout: fix the requisition and allocation - SL #4157

Same as commit c558285, size_request is deprecated and the
get_preferred* should be used instead.  So we need to implement
do_get_preferred_size instead of do_size_request.

Signed-off-by: Manuel Quiñones <[email protected]>
Acked-by: Simon Schampijer <[email protected]>

src/jarabe/desktop/favoriteslayout.py

@@ -175,7 +175,7 @@ def allocate_children(self, allocation, children):
                 width, height = self._get_child_grid_size(child)
                 self._grid.add(child, width, height, None, None, locked=False)
 
-            requisition = child.size_request()
+            requisition = child.get_preferred_size()[0]
             rect = self._grid.get_child_rect(child)
             child_allocation = Gdk.Rectangle()
             child_allocation.x = int(round(rect.x * _CELL_SIZE))

src/jarabe/desktop/snowflakelayout.py

@@ -71,10 +71,20 @@ def remove(self, child):
         del self._children[child]
         self.remove(child)
 
-    def do_size_request(self, requisition):
+    def do_get_preferred_size(self):
         size = self._calculate_size()
+        requisition = Gtk.Requisition()
         requisition.width = size
         requisition.height = size
+        return (requisition, requisition)
+
+    def do_get_preferred_width(self):
+        size = self._calculate_size()
+        return (size, size)
+
+    def do_get_preferred_height(self):
+        size = self._calculate_size()
+        return (size, size)
 
     def do_size_allocate(self, allocation):
         self.set_allocation(allocation)