'fadingEdgeEndFraction' is not visible during round pause

Nobody has claimed this yet.

Firstly, thank you for this cool package. It saves me a lot of time now! One thing I noticed is that `fadingEdgeEndFraction` is visible at the beginning but when I set `pauseAfterRound` it is not visible for that time.

Code to reproduce:

```
@override
Widget build(BuildContext context) {
return SizedBox(
height: 25,
child: AutoSizeText(
"... long text ...",
minFontSize: 19,
maxFontSize: 19,
style: const TextStyle(
fontSize: 19,
decoration: TextDecoration.none,
),
overflowReplacement: Marquee(
text: "... long text ...",
velocity: 50,
startAfter: const Duration(seconds: 3),
blankSpace: 48.0,
startPadding: 24.0,
pauseAfterRound: const Duration(seconds: 3),
fadingEdgeStartFraction: 0.15,
fadingEdgeEndFraction: 0.15,
style: const TextStyle(
fontSize: 19,
decoration: TextDecoration.none,
),
),
),
);
}
```

My expectation is that it is also visible while it is paused by `pauseAfterRound`.

Reproduce the issue with the provided Flutter widget configuration, focusing on `pauseAfterRound` together with `fadingEdgeEndFraction`. Trace the marquee widget's pause and fading-edge behavior to determine why the end fade disappears during the pause. Done means the configured end fade remains visible throughout each pause after a round.

Written by the indexing model from the issue text.