That's a random image from the internets (though it's probably a screenshot of old Visual Studio).

I agree that IDE should implement it. Visual Studio (with few extensions) does it very well (at least for me).

My point is that when I browse code within SmartGit (e.g. when investigating or resolving conflicts) I feel kinda naked, stripped down from that feature, unable to figure out where things are used in the file at a quick glance. That slows me down when working with SmartGit, sometimes significantly.

it looks something like this:

notice the green marks on the vertical scrollbar which indicate the positions of matches in text