How to make "Title bar window shake" work, when Window undecorated is enabled.

[Omico]

In Windows, we have a "Title bar window shake" feature.

When I use a custom title bar via WindowDraggableArea, the "Title bar window shake" feature has gone.

What should I do?

[Omico]

With custom title bar

fun main() = application {
    Window(
        onCloseRequest = ::exitApplication,
        title = "Demo",
        undecorated = true,
        transparent = true,
    ) {
       ...
    }
}

2021-11-27.02-07-36.mp4

With out custom title bar

fun main() = application {
    Window(
        onCloseRequest = ::exitApplication,
        title = "Demo",
    ) {
       ...
    }
}

2021-11-27.02-06-45.mp4

[mahozad]

The below solution will probably get you in the right direction.
I think you should implement the hit test function in the CustomWindowProcessor as was implemented in the Swing (JFrame) version linked in the comment:

• Missing animations when minimizing/maximizing/restoring undecorated window #3388 (comment)