Steps to reproduce:

1. Enable the Zoom accessibility feature (System Preferences > Accessibility > Zoom > check "Use scroll gesture...") with zoom following text cursor (check "Zoom follows keyboard focus")
2. Open a document in TextMate
3. Zoom yourself in (⌃-scroll up), preferably as much as possible to really experience this bug
4. Start typing some text

Expected Results:
Zoom follows (jumps) to the current text position when necessary to ensure text cursor is always displayed within the area displayed (zoomed-into) by Zoom.

Expected Results:
Zoom follows (jumps) to the current text position when necessary to ensure text cursor is always displayed within the area displayed (zoomed-into) by Zoom, but only after entering a TAB character (⇥), newline character (↩) or after TextMate performs a soft line wrap. It does not do this when entering any other character (like letters), or deleting text using backspace (⌫).