Use an AsyncHook for picker preview highlighting #9638
Closed
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The picker previously used the IdleTimeout event as a trigger for syntax-highlighting the currently selected document in the preview pane. This is a bit ad-hoc now that the event system has landed and we can refactor towards an AsyncHook (like those used for LSP completion and signature-help). This should resolve some odd scenarios where the preview did not highlight because of a race between the idle timeout and items appearing in the picker.
Connects #9629
Fixes #4956