feat($state): event when preventing state transition to self

[nikaspran]

Fire a $stateChangeToSamePrevented event when transitioning to self.

This adds an end event broadcast for state change scenario A->B->A (currently, the $stateChangeStart event would be broadcast but neither $stateChangeSuccess nor $stateChangeError would signal the completion - meaning you can't cover the entire state transition via event handling).

Closes #1016

[Cinamonas]

+1

[nateabele]

I'll come back to this in a minute.

[sarunas]

+1

[marshall007]

@nateabele can we get a release for this pretty soon? There don't seem to be any possible workarounds.

On a related note, it would be nice if $state.transition were assigned before emitting $stateChangeStart so that you could observe every state transition that way too.

[marshall007]

Also, even though this would change existing behavior, I think a $stateChangeStart should be emitted even when we're not triggering a reload. That way theres a single $stateChangeStart event per $stateChange(Success|Error|ToSamePrevented) and vice versa.

[nikaspran]

@nateabele are there any hopes of getting this merged in?

[nateabele]

Nope, but, you'll have an interface to equivalent functionality in the next release. :-)

[marshall007]

@nikaspran I think this will finally be solved once #1090 lands!