When Lock Track Height is activated for at least one track, the Marquee Zoom modifier zooms in
unlocked tracks as it should but does not fully scroll them into view on Y axis (see licecap demo below).
Here is a good way to reproduce it:
1. Create 5 tracks and give them random height.
2. Toggle "Lock Track Height" on for first 4 tracks (green in the licecap).
3. Marquee zoom the 5th track only (pink in the licecap).
The result is the track does get zoomed in but not scrolled into view fully.
The vertical offset grows the more locked-height-tracks you have or the taller the locked tracks are.