Cedric Reichenbach created CB-13947:
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Summary: Back button behavior doesn't revert to default when
removing listeners
Key: CB-13947
URL: https://issues.apache.org/jira/browse/CB-13947
Project: Apache Cordova
Issue Type: Bug
Components: cordova-android
Affects Versions: cordova-android-7.0.0
Reporter: Cedric Reichenbach
Assignee: Joe Bowser
When adding a `backbutton` event listener to `document`, Cordova disables
default back button behavior (which is usually closing the app).
Later, when removing the last event listener, it should re-enable default
behavior, but does not.
## Technical background
Internally, cordova seems to use a channel to handle document event listener
registrations, which should update the override state on every listener
addition/removal:
[https://github.com/apache/cordova-android/blob/eddad666ff60129bf716cee61c24d3d65741640f/bin/templates/project/assets/www/cordova.js#L1664]
However, debugging indicates that `onHasSubscribersChange` is only triggered
once, when adding a listener for the first time, but never on removal.
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