Add setting: Sidebar always expanded

[timp]

The new sidebar is only useful to me if it's expanded because the favicons are often the same for tabs and thus I need to see the tab title. Unfortunately, sometimes the sidebar gets collapsed and has to be expanded again. A setting to always have it exapanded (or to maintain a minimum size) would be good.

[Jon]

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[2mustange]

Wouldn't this be a bug? There is already an option to keep the sidebar expanded