MxBoxLayout allocation bug

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The children's allocation doesn't honour the MX_ALIGN_END flag when the allocation box is smaller than the sum of all children's natural width/height.

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const Lang = imports.lang;
const Clutter = imports.gi.Clutter;
const Mx = imports.gi.Mx;

Clutter.init(null, null);

var mwindow = new Mx.Window();
mwindow.connect('destroy', Lang.bind(this, Clutter.main_quit));
mwindow.set_window_size(200, 100);

var mhbox = new Mx.BoxLayout({ orientation: Mx.Orientation.HORIZONTAL });
mwindow.set_child(mhbox);

var hbox_buttons = new Mx.BoxLayout({ orientation: Mx.Orientation.HORIZONTAL });
mhbox.add_actor(hbox_buttons, 0);
mhbox.child_set_expand(hbox_buttons, true);
mhbox.child_set_x_fill(hbox_buttons, false);
mhbox.child_set_x_align(hbox_buttons, Mx.Align.START);

var hbox_applets = new Mx.BoxLayout({ orientation: Mx.Orientation.HORIZONTAL });
mhbox.add_actor(hbox_applets, 2);
mhbox.child_set_expand(hbox_applets, false);
mhbox.child_set_x_fill(hbox_applets, false);
mhbox.child_set_x_align(hbox_applets, Mx.Align.END);

var button = new Mx.Button({ label: "Test1 Test1",
icon_name: "player_play",
label_visible: true });
hbox_buttons.add_actor(button, 0);
var button = new Mx.Button({ label: "Test2 Test2",
icon_name: "player_play" });
hbox_buttons.add_actor(button, 1);
var button = new Mx.Button({ label: "Test3 Test3",
icon_name: "player_play" });
hbox_buttons.add_actor(button, 2);

var button = new Mx.Button({ label: "Applet1",
icon_name: "player_play" });
hbox_applets.add_actor(button, 0);

mwindow.show();

Clutter.main();

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Previously attached, a javascript example of the problem.
Try to expand the window's width, and at some point you will see the last button jumping from the right end side of the previous button to the end of the window.
This button should always be at the end if the window.