Application doesn't respond to touch events in split window mode on iPad

[etolstoy]

Describe the bug
When the application is being run in a split view mode in iPad, it responds to touches only when being launched in the left pane. When it's dragged to the right pane, it stops responding. Though if a physical keyboard is connected, it doesn't loose focus and you can continue typing.

IMG_0034.MOV

Affected platforms

• iOS (iPad only)

Versions

• Kotlin version*: 1.8.20
• Compose Multiplatform version*: 1.4.0
• OS version(s)* (required for Desktop and iOS issues): iPadOS 16.1.1

To Reproduce

1. Launch the Compose app.
2. Run it in a split view with another app.
3. Drag Compose app to the right pane.

[paxbun]

Same thing happens when the app is launched in full-screen mode and then switched into a slide over window.

[paxbun]

It seems like Compose always assumes that the window is at (0, 0). The left split view works well and on the left slide over mode, the buttons that are slightly off from the touch position are pressed.

[paxbun]

Would this line be the culprit? I think it should be touch.locationInView(this), not null.
https://github.com/JetBrains/skiko/blob/39fb88f6a22bdd20f1cd82e3719b005885ca3648/skiko/src/iosMain/kotlin/org/jetbrains/skiko/SkikoUIView.kt#L228

It seems not. I edited SkikoUIView.kt as follows, but the results of touch.locationInView(this) and touch.locationInView(null) are the same. In addition, Skiko is reporting the coordinates correctly.

    private fun sendTouchEventToSkikoView(event: UIEvent, kind: SkikoPointerEventKind) {
        val pointers = event.touchesForView(this).orEmpty().map {
            val touch = it as UITouch
            val (x, y) = touch.locationInView(null).useContents { x to y }
            val (viewRelativeX, viewRelativeY) = touch.locationInView(this).useContents { x to y }
            println("Skiko: Touch Event at ($x, $y), relative = ($viewRelativeX, $viewRelativeY)")

[okushnikov]

Please check the following ticket on YouTrack for follow-ups to this issue. GitHub issues will be closed in the coming weeks.