Operation "Revert to last state" is incorrect.

After several attempts to set proper caching on Views row caching, just disable the caching. The views should be very fast anyway.

Also set 'Revert' to first place in view's operations dropdown buttons, to make it more visible.

Just for the record. My attempts until now in the attached patch.

This should now definitely fixed.
Also removed some commented code and duplicated code in the widget, which would introduce doubt.
We can now rely on Views' #245089: How to display Tags inline? →

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