Bug: Separators only look back one widget when determining what to show, skipping no-render widgets #518

Widgets that arbitrarily may or may not render content (such as Git status) when used in a layout like so:

(git branch) (Separator | ) (Git changes) (Separator [Space]) (Git Status) (Separator |) (Git root) 
⎇ main | (+42,-10) +* | my-repo

Results in a situation where if there is no git status, the printed line will instead be:

⎇ main | (+0,-0) my-repo

Claude Suggested Fix

The fix that avoids reintroducing #344's orphan-separator bug: instead of stopping at the first preceding non-separator widget regardless of content, keep walking back through empty widgets, but treat an actual separator (not flex-separator) as a hard stop — because that earlier separator already owns the boundary to whatever's beyond it.