Make cd work like pushd/popd

[kas2020-commits]

As I've already mentioned in #13959, I have to work on an extremely large monorepo that's mounted as a network-based, pam-controlled filesystem. Because of this, cd, open and friends are extremely painful to use because the command completion feature performs blocking I/O for suggestions.

I've gotten around some of the difficulties by pre-configuring subdirs I typically work in, avoiding the blocking I/O:

[keys.normal."`"]
a = [ ":open a/b/c" ]
b = [ ":open d/e/f" ]
...

but this isn't composable. Sometimes, I want to temporarily "anchor" my working dir to a specific subdir based on some buffer I've opened, then go back to the root dir once I'm done fiddling. This is very painful because I have to run :cd ../../.. to get back, which WILL do blocking I/O as I type it out, not to mention I have to count how nested I've become relative to the root every time.

This can be easily solved though, if helix were to add an in-memory stack-based cd. This can either be a pair of new commands (pushd and popd) or this can be the default behavior for cd, and only add 1 new command called popd or similar. I'm not picky either way.

It seems simple to implement (I would gladly write this feature if I got some assurance that it would get merged) and would help a lot (like, a lot a lot) for moving around quickly in the editor. Would the team accept patches for this feature if I wrote it?