I've looked this up and set this on every single mac I've used since I switched to TextMate 2 so I guess it is time to finally write it down for myself:
- Open a command prompt.
- Edit the file ~/Library/Application Support/TextMate/Global.tmProperties
- Add the line saveOnBlur = true in the top region before the square bracket sections.
- Save and Exit
- Relaunch and it should be there.
Posted In: #textmate