[Zotero 7 Beta]: Width of collections pane not remembered between restarts

In Z7 beta (currently 7.0.0-beta.74+2e8073ab9 (64-bit), but since a couple of upgrades now) the width of the collections pane does not seem to be remembered between restarts of Zotero and has manually to be re-sized each time.

This is an issue with a complex hierarchy of sub-folders which need to be kept expanded.

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