Only mark currently opened file as selected in "Project Tree"
Earlier today I got confused about the file that was opened. The reason was that I had selected one file in the "Project Tree" and then switched the (single) view to show a different file using the top drop down. At some point I thought the file opened must be the one selected in the "Project Tree" while this was obviously not the case at that point.
The easiest solution might be to just de-select the file in the "Project Tree" when another file is being edited in the editor. Another solution might be to always select the file that is currently being edited. However, I suspect that scrolling in response to such a selection change might also be confusing.