Jitter in the file browser when refreshed

[krassowski]

Description

I am noticing a jitter in the file browser on refreshing it. Please see the attached gif.

Reproduce

Click on the refresh button in the filebrowser.
This is more easily reproducible when there is a large number of items in a directory.

Context

I'm using - jupyterlab==4.0.6

Originally posted by @divyansshhh in jupyterlab/jupyterlab#15365

[krassowski]

This looks related to how the favourite icon in breadcrumbs is rendered with a delay; while a simple fix would be to apply some constant height it might not work with themes, and ideally when breadcrumbs do not change the widget should not be re-rendered at all. Maybe this something that will need addressing in JupyterLab too, but then even when breadcrumbs change the the folder was renamed the icon ideally would not need to be re-rendered.

Maybe the signal is to eagerly emitted?

jupyterlab-favorites/src/components.tsx

Lines 126 to 130 in 90b2de2

	return (
	<UseSignal
	signal={props.manager.favoritesChanged}
	initialSender={props.manager}
	>