http://plunker.no.de/edit/G6PORO?live=preview

if you click on the button you'll see that the location is properly updated and $$reset flag is reset to false after the $digest cycle.

if you click the button one more time, the $$reset flag remains set to true after we exit the digest loop. This is because we reset the $$reset flag only if the $location changed during the digest cycle. In this case the second click set location to the current value, so there is no change.

we should add $$reset value to the internal $location watch so that this value is observed and the flag is reset even when the $location doesn't change.