Fix controller swipe

[f3d0ss]

When you call controller.forward(direction: SwipeDirection.Right) (or Left) while the animation of an older call is still ongoing the controller store a SwipeInfo with SwipeDirection.Right.

tcard/lib/src/controller.dart

Line 22 in 10b7d7f

state!.swipeInfoList.add(SwipeInfo(state!.frontCardIndex, direction));

When the controller then call state!.runChangeOrderAnimation() the state find an older animation is still ongoing and the it return without doing nothing.
This way at the next controller.forward(direction: SwipeDirection.Left) (or Right) the card will swipe in the wrong direction.

A easy fix is to remove the last SwipeInfo if the animation is still ongoing.

[f3d0ss]

Is there a reason why my PR is ignored?
I ask because I'm not an expert and I would like to know if it's because I have done something wrong.