MRTK3: Scrolling Views do not work with user input.

[SimonDarksideJ]

Describe the bug

A clear and concise description of what the bug is. Tested all of the available MS examples on using a Scrolling View with the MRTK3, yet none actually function with user input.

Valiated:

• Hero Panel in CanvasExamples
• VirtualizedScrollRectList - turning off the script that automatically moves the view
• Setting up a new ScrollRect with MRTK3 buttons

All the input seems to be captured by the content and none of the scroll behaviour makes it's way up to the scrollrect. Even using a Scrollbar does nothing.

To reproduce

Steps to reproduce the behavior:

1. Open MRTK3 VirtualizedScrollRectList
2. Disable the Virtualized Scroll Rect List Tester component on the Scroll View (to allow for manual input)
3. TRY to scroll using far pointers or near hand interactions
4. See error

Expected behavior

ScrollRects should be interactable with using input via near hands or far pointers, to scroll the view.

Your setup (please complete the following information)

• Unity Version [e.g. 2020.3.36f1]
• MRTK Version [e.g. v3.0] - latest

Target platform (please complete the following information)

• HoloLens 2

[SimonDarksideJ]

A bit of an update, after some tweaking of the controls I returned to testing and found it was possible to scroll in the view (quite a relief that it is even possible), however this still leaves it practically unusable. I suspect if you manage to grab an item by its shadow or something a few pixels wide of the buttons collider, you can get an interaction back to the panel behind it and actually scroll.

Ideally though, if a Selectable is Grabbed and the use attempts to drag, then this input should be fed through to the parent scrolling area (if there is one), so that scrolling is possible wherever you drag in a Scrollable area.

[jessemcculloch]

I have a video from Simon if anyone on the MRTK team needs to see it. Just let me know over Teams if so.

[Zee2]

@SimonDarksideJ, Scrolling is not yet implemented for this preview release. I've been working on it for the past few weeks, stay tuned!

There's a reason this is still in preview 😉

[Zee2]

Tracking this work in #10795 !

[Zee2]

Closing as duplicated from the PR. I'll be posting additional updates over on the PR page.