Panel glitching and stopping in the middle every so often

Created by: PhpXp

Since I first tried this library I had a problem that every 1 in 50 times or so the panel glitched and got stuck in the middle even though I had no anchor point set.

Example: https://gfycat.com/SeparateInformalAmericanavocet

ignore the View animations it's just an example I think it happens when I try to expand the panel very quickly.

After some debugging I noticed the issue is in the ViewDragHelper:

public boolean continueSettling(boolean deferCallbacks) {
    // Make sure, there is a captured view
    if (mCapturedView == null) {
        return false;
    }
    if (mDragState == STATE_SETTLING) {
        boolean keepGoing = mScroller.computeScrollOffset();
        final int x = mScroller.getCurrX();
        final int y = mScroller.getCurrY();
        final int dx = x - mCapturedView.getLeft();
        final int dy = y - mCapturedView.getTop();

        if(!keepGoing && dy != 0) { //add this 5 lines
            //Invalid drag state
            mCapturedView.setTop(0);
            return true;
        }
        // ...

I don't know why it happens but everytime it does, keepGoing is false but dy is a very large negative number (around -600) instead of 0. The correct behaviour is that when y is getting close to 0, so should dy.

So adding those 5 lines fixes the glitching but it's really just a workaround.

I have Android 5.1.1 on an Z3 Compact, but the issue was already present in 5.0.2.

Does anyone else experience this glitch?