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Allow --track to accept an optional nth expression for cross-reload tracking. When a reload is triggered, fzf extracts a tracking key from the current item using the nth expression, blocks the UI, and searches for a matching item in the reloaded list. - --track=.. tracks by entire line, --track=1 by first field, etc. - --track without NTH retains existing index-based behavior - UI is blocked during search (dimmed query, hidden cursor, +T*/+t*) - reload unblocks eagerly on match; reload-sync waits for stream end - Escape/Ctrl-C cancels blocked state without quitting - track-current action accepts optional nth: track-current(1) - Validate nth expression at parse time for both --track and track() - Cache trackKeyFor results per item to avoid redundant computation - Rename executeRegexp to argActionRegexp Close #4701 Close #3460