Sidenav backdrop problem when changing align dynamically from left to right

[doorman02]

I have a push state sidenav which is aligned left or right depending on the size of the browser.
<md-sidenav align="{{alignAttr}}" mode="push">
I am detecting this on browser resize.

The sidenav push mechanism works fine, when align is set to start it appears from left and from right when set to end. However the main window which is under the black transparent backdrop is animated in the wrong direction when the align attribute changes dynamically.

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