Commands in keybinds block the viewport

[postsolar]

# .helix/config.toml
[keys.normal.A-space]
r = [ ":hs /dev/null", ":insert-output sleep 3; echo 1" ]

Expected behavior

I would see a split open and then only the command I run would block.

Actual behavior

The command first blocks. The split opens only when the command completes.

Related discussion

The ideal solution for my use case would be the option to run a command and insert its output asynchronously. I admit it might sound somewhat close to the idea of an integrated terminal, but I think the key difference here is that there's no shell and no interaction with a shell involved — just non-blocking auto-reload of a file.

[kirawi]

This underlying reason is possibly related to #9126 and #6513