[ResourceList] initial selection causes UI glitch

[schiller-manuel]

Issue summary

When rendering a ResourceList with a selectedItems prop that is NOT empty, the UI glitches as shown in the video:

resourcelist-bug.mp4

The UI works again once either the window is resized or the selection is changed.

As a workaround, the selectedItems can be set in a useEffect.

Expected behavior

If selectedItems is not empty, UI should work as usual.

Actual behavior

UI glitches.

Steps to reproduce the problem

1. render a ResourceList with a non-empty selectedItems prop

Reduced test case

see stories at schiller-manuel@181d80e

Specifications

• Are you using the React components? (Y/N): Y
• Polaris version number: 12.11.1
• Browser: Firefox
• Device: Desktop
• Operating System: macOS

[github-actions]

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