Hardware back button not disabled while loading overlay is active

[gouegd]

This issue is related to #1222 (which was fixed and closed).

The Android hardware back button navigates back while the loading overlay (from $ionicLoading) is displayed.
Personally I avoid this by making the back button close the loading (I use promises to know it's been closed or not), but in some cases it could be better to just ignore the back button.

Ideally I think there would be a sensible default (no action ?), and the possibility the add one's own callback.

What do you think ?

[ajoslin]

Sounds good, adding.

[ajoslin]

Added!

[gouegd]

Great, thanks ! I can see in the code there's now a noop for the back button.

[ionitron-bot]

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