Currently if you call editor.revealRange with a range that doesn't fit on the screen, it still centers the middle line. This means if it's a class/method/whatever you get a random chunk from the middle.

It should be possible (default, IMO, but at least an option) to always ensure the first line is in view, since it's almost always likely that the earlier lines in the range are more important to see than the middle lines (since the start of the range is likely the start of a declaration of something).