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From "Cedric Reichenbach (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CB-13947) Back button behavior doesn't revert to default when removing listeners
Date Sat, 03 Mar 2018 18:46:00 GMT
Cedric Reichenbach created CB-13947:
---------------------------------------

             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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