Completions were invoked on a background queue. Most call sites wrapped
their UI work in DispatchQueue.main.async, but upgradeSingle's completion
calls refreshAll(), which sets statusMenuItem.title directly — an AppKit
mutation off the main thread. It also raced on cachedOutdated /
lastOutdatedFetch (written from background, read from main).
runBrew now always dispatches its completion to the main queue, so every
caller can safely touch UI, and the now-redundant inner main.async hops
are removed.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Extract brew output parsing into BrewParser.swift (pure Swift, no AppKit)
and add BrewBarTests target with 7 passing tests covering parseOutdated
and parseVersion edge cases.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
maxsoch
Maxence Socheleau