Some IDE actions don't work in the secondary editor

For example, Cmd+F12 (File Structure) shows the structure of the main editor, even if the secondary editor has focus.
The same goes for Alt-F1,1: I want to select the file from the secondary editor in the Project View, but the file from the main editor is selected instead.

This is very annoying.

Reproduce the issue with a secondary editor focused, then run Cmd+F12 and Alt-F1,1 to compare their behavior with the main editor. Trace the IDE action handling from those commands and identify where the focused editor is ignored. Done means both actions use the secondary editor's file and context when it has focus.

Written by the indexing model from the issue text.