poderosaproject/poderosa — pull request #1 by saitoha (2013-05-28 16:11:50+00:00)
Title: Add support for forcus reporting mode (xterm)

This patch adds "focus repoting mode" feature (xterm, private mode 1004) to Poderosa. this provides focus-aware usability to some terminal applications. When this mode is enabled, CSI I (focus-in event) and CSI O (focus-out event) will be fired.