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https://issues.apache.org/jira/browse/CB-13947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16386578#comment-16386578
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Joe Bowser commented on CB-13947:
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This sounds more like a cordova-js error than a cordova-android error.
> 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, cordova-js
> Affects Versions: cordova-android-7.0.0
> Reporter: Cedric Reichenbach
> Assignee: Joe Bowser
> Priority: Major
>
> 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.
> h2. Technical details
> 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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