Larger seek history for unsynced widgets

[dryBoneMarrow]

Is your feature request related to a problem? Please describe.

To go to the last position, one can use ESC. When I am in an unsynced widget it is only possible to go back to the last position, it switches back on forth between my current and last position when pressing ESC repeatedly. Most of the time, I want to go back further in time. In a synced widget however, pressing the ESC multiple times goes farther back in the seek-history.

Describe the solution you'd like
It would be nice if I could go back further in history in an unsynced widget. Also, going forth should be possible as well, hence using alt+-> and alt+<- should act on the seek history of the unsynced (/current) widget if I have an unsynced widget open instead of the global seek.

Describe alternatives you've considered

Another option would be to go manually back to the desired position.
Or having different sync-groups which shared seek-history would also be neat.

Additional context
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