No terminal emulator supports that. Because that's not the emulator's responsibility. That's your shell's job. Asking for your terminal emulator to support command completion is like asking X Windows to add tab completion to Gedit.
Go grab a copy of fish if you want, though. I've heard a lot of good things about it.
>Current directory widget? Collapsible output?
Those are just hard to implement, and usually not worth the effort. The directory widget is essentially provided by your prompt in many shells anyways.
A lot of them, actually. Sixel is a thing.
>Completion popups? Browsable history?
No terminal emulator supports that. Because that's not the emulator's responsibility. That's your shell's job. Asking for your terminal emulator to support command completion is like asking X Windows to add tab completion to Gedit.
Go grab a copy of fish if you want, though. I've heard a lot of good things about it.
>Current directory widget? Collapsible output?
Those are just hard to implement, and usually not worth the effort. The directory widget is essentially provided by your prompt in many shells anyways.