In spread layout always get width/height request to not

confuse hippo. Eventually we will have to deal with size
changes in a better way. Fix flakes count in SnowflakeLayout.
Fix #5904

shell/view/home/MeshBox.py

@@ -267,7 +267,7 @@ class ActivityView(hippo.CanvasBox):
         self.set_layout(self._layout)
 
         self._icon = self._create_icon()
-        self._layout.add_center(self._icon)
+        self._layout.add(self._icon, center=True)
 
         self._update_palette()
 
@@ -343,7 +343,7 @@ class ActivityView(hippo.CanvasBox):
     def _color_changed_cb(self, activity, pspec):
         self._layout.remove(self._icon)
         self._icon = self._create_icon()
-        self._layout.add_center(self._icon)
+        self._layout.add(self._icon, center=True)
         self._icon.set_palette(self._palette)
 
     def _private_changed_cb(self, activity, pspec):

shell/view/home/snowflakelayout.py

@@ -31,18 +31,21 @@ class SnowflakeLayout(gobject.GObject,hippo.CanvasLayout):
         gobject.GObject.__init__(self)
         self._nflakes = 0
 
-    def add(self, child):
+    def add(self, child, center=False):
+        if not center:
+            self._nflakes += 1
+
         self._box.append(child)
 
         box_child = self._box.find_box_child(child)
-        box_child.is_center = False
-
-        self._nflakes += 1
+        box_child.is_center = center
 
-    def add_center(self, child):
-        self._box.append(child)
+    def remove(self, child):
         box_child = self._box.find_box_child(child)
-        box_child.is_center = True
+        if not box_child.is_center:
+            self._nflakes -= 1
+
+        self._box.remove(child)
 
     def do_set_box(self, box):
         self._box = box

shell/view/home/spreadlayout.py

@@ -218,6 +218,10 @@ class SpreadLayout(gobject.GObject, hippo.CanvasLayout):
     def do_allocate(self, x, y, width, height,
                     req_width, req_height, origin_changed):
         for child in self._box.get_layout_children():
+            # We need to always get  requests to not confuse hippo
+            min_w, child_width = child.get_width_request()
+            min_h, child_height = child.get_height_request(child_width)
+
             rect = child.grid_rect
             if child.grid_rect:
                 child.allocate(rect.x * _CELL_SIZE,
@@ -227,8 +231,6 @@ class SpreadLayout(gobject.GObject, hippo.CanvasLayout):
                                origin_changed)
             else:
                 vertical_offset = child.vertical_offset
-                min_w, child_width = child.get_width_request()
-                min_h, child_height = child.get_height_request(child_width)
                 child_x = x + (width - child_width) / 2
                 child_y = y + (height - child_height + vertical_offset) / 2
                 child.allocate(child_x, child_y, child_width, child_height,