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Use case or problem
After becoming comfortable with vim motions, any action which requires mouse input while text editing is now a very noticeable workflow interrupt. In addition to quickly being able to swap between two tabs split across one window, I would also like to peek at my to-do list, which I have placed in the sidebar, without taking my hands off the keyboard.
Proposed solution
Add to the available hotkeys:
Left Sidebar Toggle
Right Sidebar Toggle
Cycle Cursor Focus Forward
Cycle Cursor Focus Backward
For parity with terminal emulators, cycle cursor focus forward should go down if there is an un-collapsed tab below, then go to the next-right top-most un-collapsed tab.

