Fix group update for valign/halign property change.
Fix group update for valign/halign property change.

xshotD/pyglet,odyaka341/pyglet,mpasternak/pyglet-fix-issue-552,kmonsoor/pyglet,arifgursel/pyglet,mpasternak/pyglet-fix-issue-552,xshotD/pyglet,odyaka341/pyglet,arifgursel/pyglet,mpasternak/michaldtz-fixes-518-522,google-code-export/pyglet,shaileshgoogler/pyglet,google-code-export/pyglet,shaileshgoogler/pyglet,mpasternak/pyglet-fix-issue-518-522,gdkar/pyglet,mpasternak/michaldtz-fixes-518-522,cledio66/pyglet,cledio66/pyglet,mpasternak/michaldtz-fix-552,Austin503/pyglet,Austin503/pyglet,google-code-export/pyglet,Austin503/pyglet,Alwnikrotikz/pyglet,kmonsoor/pyglet,mpasternak/pyglet-fix-issue-552,arifgursel/pyglet,gdkar/pyglet,mpasternak/pyglet-fix-issue-518-522,mpasternak/michaldtz-fixes-518-522,xshotD/pyglet,Alwnikrotikz/pyglet,kmonsoor/pyglet,mpasternak/michaldtz-fix-552,Alwnikrotikz/pyglet,mpasternak/michaldtz-fix-552,cledio66/pyglet,odyaka341/pyglet,qbektrix/pyglet,shaileshgoogler/pyglet,cledio66/pyglet,shaileshgoogler/pyglet,google-code-export/pyglet,Austin503/pyglet,cledio66/pyglet,kmonsoor/pyglet,mpasternak/michaldtz-fix-552,Alwnikrotikz/pyglet,mpasternak/pyglet-fix-issue-518-522,gdkar/pyglet,mpasternak/pyglet-fix-issue-518-522,shaileshgoogler/pyglet,arifgursel/pyglet,gdkar/pyglet,odyaka341/pyglet,xshotD/pyglet,mpasternak/michaldtz-fixes-518-522,qbektrix/pyglet,kmonsoor/pyglet,qbektrix/pyglet,Austin503/pyglet,mpasternak/pyglet-fix-issue-552,arifgursel/pyglet,qbektrix/pyglet,qbektrix/pyglet,Alwnikrotikz/pyglet,gdkar/pyglet,odyaka341/pyglet,xshotD/pyglet,google-code-export/pyglet