Briefly flash the status line of the focused window whenever you change window.
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plugin
README

README

This is a mirror of http://www.vim.org/scripts/script.php?script_id=4289

Blinks the status line of the newly focused window whenever you change window, by switching its highlight between 
StatusLineLit and StatusLineUnLit on WinEnter and CursorHold events.

Can be helpful to visually track which window you have moved to.