Open the same file multiple times

• Go into the pane you want to see the file in.
• Type Ctrl-p (Mac: ⌘-p) to get the list of files available.
• Select the one you're after and it will be loaded into the current pane

(Even if it's already open in another pane.)

File | New View into File will open a second tab for the same file. This can be moved into another window or tab group.