Would be nice to have an "explorer mode" for navigating an outline with keys - namely:
- left arrow collapses subitems to parent
- right arrow expands parent to show next level of subitems
Right now left and right arrow move between columns.
Maybe the left and right arrow could still move between columns, except in the tree column. In the tree column, the first press of right arrow might expand an item it has any hidden subitems - the second press of right arrow would move to the next column to the right. Similarly, first press of left arrow would collapse to parent if any; second press would move to next column left.
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