[idea] Let worktree-child Space rows have their own row layout / token styles

[lunelson]

idea / problem

Hey there, I'm loving herdr, and I recently used its worktree-listing functionality for the first time, where I ran in to a small friction.

I've configured my sidebar spaces with the repo name on line 1 and dimmed detail below it:

[ui.sidebar.spaces]
rows = [
  ["state_icon", "workspace"],
  [{ token = "branch", dim = true }, { token = "git_status", dim = true }],
  [{ token = "$jj_bookmark", dim = true }, { token = "$jj_status", dim = true }],
]

On worktree child rows however, the branch token comes out not dimmed, and I couldn't find any config for it. AFAICT in 0.8.0, an indented child row does two things: grouped_child_display_label substitutes the branch text into the workspace token, and suppress_git_details drops branch and git_status. So IIUC my second row resolves to nothing and thus the branch ends up rendered with the workspace name style rather than the style I set on the branch token.

I could do { token = "workspace", dim = true }, but that dims top-level repo names too, which defeats the point.

requested change

What I'd like is to style child rows independently, e.g. an optional override next to rows, something like:

[ui.sidebar.spaces]
rows = [...]
rows_for_worktree = [["state_icon", { token = "workspace", dim = true }]]

why you want this

This would let me keep sidebar theming consistent WRT the coloring of secondary rows. I've noticed it also overlaps with #1485, which runs into the same two mechanisms from the content side (wanting folder and branch on children); I believe one child-row override would cover both cases. And #2321 is also asking for a worktree-specific key in this table.