Feature idea: keyboard shortcuts for collapsing and expanding the active container

[metastable-void]

Discussed in #319

^{Originally posted by metastable-void November 28, 2023}
We are planning to add new keyboard shorcuts to collapse/expand the currently active container on the active window.

What key combinations best suit your needs? Your input is very appreciated.

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Add 'Focus to this container' to context menus for tabs