[fish] Enable multiple history commands insertion

[bitraid]

I recently realized that the become action leaves behind temporary files, so I made some modifications to overcome this. While doing so, I thought it would be a good idea to allow inserting multiple commands when --multi is set. If for some reason you don't like this, I can remove this functionality and just adjust the code to not use become. If on the other hand you think that it should be enabled by default, I can make this change, too. Tested to work with the oldest supported fish version.

[junegunn]

allow inserting multiple commands when --multi is set.

Thanks, I think this is very nice. I didn't do it in other shells, only because it was difficult to get it right.

[junegunn]

I recently realized that the become action leaves behind temporary files

Could you clarify which temporary files you mean? I wonder if it's a bug of fzf.

[bitraid]

I recently realized that the become action leaves behind temporary files

Could you clarify which temporary files you mean? I wonder if it's a bug of fzf.

The /tmp/fzf-{temp,proxy)-* files. I also thought that it might be bug of fzf, but after looking briefly at the code, I saw the comment below and figured that it's probably not, so I didn't look more into it:

fzf/src/terminal.go

Lines 4919 to 4922 in e4489dc

	case actBecome:
	valid, list := t.buildPlusList(a.a, false)
	if valid {
	// We do not remove temp files in this case

[junegunn]

Thanks! Merged with a test case.