Added command to copy between registers

[uek-1]

Added a command to copy the contents of the selected register to another. Closes #9552.

[pascalkuthe]

I wonder if this is quite the right command tough. kacuone has a more generic :set-register typable command. That could be combined with command expansion (where I think being able to expand to registers would be quite useful) to implement the same thing

[uek-1]

I wonder if this is quite the right command tough. kacuone has a more generic :set-register typable command. That could be combined with command expansion (where I think being able to expand to registers would be quite useful) to implement the same thing

To be clear, one would do this in kakoune by typing :set_register <destination_register> %reg{source_register} right? If so, I think this is super versatile but I think it may be less intuitive than an explicit copy command.

[the-mikedavis]

I think a :set-register command could also be useful but it might be complicated to use it to copy between registers, for example if you're copying a set of selections from one register to another

[pascalkuthe]

We discussed this briefly: I don't think a typable:copy-register command carrys its weight over :set-register %reg{..} but an interactive version bound to a key that would prompt the user which registers to copy from/to would.be worth adding

[the-mikedavis]

To make this a little more interactive let's show the autoinfo popup for the registers like in select_register:

helix/helix-term/src/commands.rs

Lines 4836 to 4844 in f46a09a

	fn select_register(cx: &mut Context) {
	cx.editor.autoinfo = Some(Info::from_registers(&cx.editor.registers));
	cx.on_next_key(move |cx, event| {
	if let Some(ch) = event.char() {
	cx.editor.autoinfo = None;
	cx.editor.selected_register = Some(ch);
	}
	})
	}

and prompt for both register with two on_next_key callbacks

[kirawi]

Should we close #7494 in favor of this?

[pascalkuthe]

Should we close #7494 in favor of this?

No we want both set-register so you can combine it with commands expansion (and use it in keymaps) and an interactive command to copy between registers.