Dialog is not shown again after flow is interrupted/canceled

[consp1racy]

Javadoc on Fragment#onRequestPermissionsResult:

Note: It is possible that the permissions request interaction with the user is interrupted. In this case you will receive empty permissions and results arrays which should be treated as a cancellation.

Current handling in RxPermissionFragment#onRequestPermissionsResult:

void onRequestPermissionsResult(String permissions[], int[] grantResults, boolean[] shouldShowRequestPermissionRationale) {
    for (int i = 0, size = permissions.length; i < size; i++) {
        //...
        mSubjects.remove(permissions[i]);
        //...
    }
}

Problem:

Requested permission list is not cleared when permission flow is interrupted.

Solution:

If permissions[] is empty, then mSubjects should be completed unsuccessfully and cleared.

Related:

#218 tries to retry immediately in this case. This is wrong because the interruption happens after onStop.

[consp1racy]

And, as always, it's not that simple.

When one permission dialog is showing and another request is issued the second request is automatically canceled.

Since everything is currently handled by one fragment we would end up in this state:

• first permission dialog still showing
• second request cancellation would cause permission subjects completed and cleared for both requests

At first glance there should be a separate permission fragment or a separate map per different request codes.