PopupWindow getting clipped on custom keyboard for Android API 28

I made a custom keyboard. When you long press a key, a PopupWindow shows some extra choices above the key. The problem is that in API 28, this popup gets clipped (or even completely hidden for the top row).

I had solved this problem for API < 28 with

popupWindow.setClippingEnabled(false);

However, with API 28 the problem has come back. Here is more of the code:

private void layoutAndShowPopupWindow(Key key, int xPosition) {
    popupWindow = new PopupWindow(popupView,
            LinearLayout.LayoutParams.WRAP_CONTENT,
            LinearLayout.LayoutParams.WRAP_CONTENT);
    popupWindow.setClippingEnabled(false);
    int location[] = new int[2];
    key.getLocationInWindow(location);
    int measureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
    popupView.measure(measureSpec, measureSpec);
    int popupWidth = popupView.getMeasuredWidth();
    int spaceAboveKey = key.getHeight() / 4;
    int x = xPosition - popupWidth / popupView.getChildCount() / 2;
    int screenWidth = getScreenWidth();
    if (x < 0) {
        x = 0;
    } else if (x + popupWidth > screenWidth) {
        x = screenWidth - popupWidth;
    }
    int y = location[1] - popupView.getMeasuredHeight() - spaceAboveKey;
    popupWindow.showAtLocation(key, Gravity.NO_GRAVITY, x, y);
}

Did something happen to no longer allow third party keyboards to show content outside of the keyboard view? (This is how it is in iOS.)

What do I need to do to get the PopupWindow to stop being clipped?

from PopupWindow getting clipped on custom keyboard for Android API 28