issue #6217 fixed. replay button doesn't appear twice.

[khashiii97]

For solving this issue, the following changes where made in Player.java:

1. A boolean field named isOnReplay was added to reflect when the user has pressed the replay button.
2. when the video would reach it's end and the onCompleted method be called, the first time isOnreplay would be set to true. the second time it entered onCompleted (fallacious behavior) it would return since isOnReplay is true.
3. in the onclick method, when the playpause button was clicked, if it was the replay button which triggered this event, playpause will be called twice (by checking isOnReplay for the second call).

Fixes #6217

[tsiflimagas]

This seems to have fixed the issue, in both normal and mini player, but not for the quick settings controls. You still have to press "replay" twice there.

[litetex]

Thank you for your PullRequest!

I found a few issues with this code:

1. We introduce a new variable only to check if we are in the "replay" state. That can certainly done without one as the state is already hold in the player.
2. It's not 100% safe that the variable is set to the correct when e.g. switching to another video (playlist) etc. This will certainly cause problems.

There is a way simpler solution:

I'll open a PR for the new solution.

[litetex]

Succeeded by #7014