Focus Source (with RStudio Keymap) doesn't work if source is in a new window

If the source is in a new window, Focus Source (with RStudio Keymap) doesn't focus the source in the new window, but tries to focus the editor panel in the same window with the console. If there is no source open in that main window, it will try to open an "empty" editor.

I was expecting the focus to go back to the new window. If there were multiple new windows, the focus should go back to the new window where the cursor was before focusing console. This is how it works in RStudio:

I am very used to writing a few lines in the source then switching to the console to try a few things, and going back and forth between the two. My hands don't need to leave the keyboard in RStudio, but in Positron I have to pause and use the mouse to click to switch back, if I want to view my source in a separate window (on a different monitor).

Reproduce the Focus Source (with RStudio Keymap) behavior with a source in a separate window, including multiple separate source windows. No files, tests, or entry points are named in the issue, so first locate the command handling focus restoration and its existing tests. Done means focus returns to the source window where the cursor was before switching to the console, without opening an empty editor.