This is the best summary I could come up with:

Updated the quick access performance menu with descriptions for each setting, including how they affect the system and the expected power/performance/visual quality tradeoffs.

Fixed user avatar in title bar momentarily switching back to default during startup.

Fixed a case where mouse click input could stop working when starting to drag operation on a steam window.

Fixed bug which would sometimes cause Steam to show UI and take focus if configured to run at system startup.

Fixed collapse state of friends list and chat group sections not being properly remembered.

Fixed a case where Steam could prevent SteamVR from properly detecting a USB connected headset and/or controllers.

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