In 1.5, the highlighting bar on the right was (perhaps optionally?) synchronized with the document editor's adjacent vertical scrollbars. So, it was possible to scroll up or down to a group of highlighted errors by dragging the scrollbar to the highlights; at the same time, the errors showed up in the editor itself. (Errors in folded regions were then shown at the top of the highlighting bar.)
In 2.0 there does not seem a way to do the same when there are folded regions - the scrollbar respects folding, the error highlighting does not.
I waited with reporting this regression for some time, but I still think it is a loss - it is much more complicated to fit several errors on the screen simultaneously, for example. Clicking on the highlighting bars for the individual errors and then scrolling is a clumsy replacement.