ReMate

ReMate is a TextMate plugin which can be used to disable the automatic project tree refresh when the application regains focus.

The plugin adds the following:

• a toggleable item to the window menu labeled “Disable Refresh on Regaining Focus” - when this is checked, projects will not be updated when TextMate regains focus.
• an option on the project menu (reached by right-clicking on an item in the project tree or the gear at the bottom of the project drawer) to “Refresh All Projects”

Download, extract, double-click.