Cursor jumps to code window from REPL window when Alt-tab is pressed

[PDAHubbard]

Reproduced with Nightcode 2.6.0 on Gnome 3.22.2 (Debian 9)

If my cursor is in the REPL window, and I Alt-Tab away from Nightcode, when I Alt-Tab back the cursor is in the Edit window. This usually leads me to typing some rubbish into my file instead carrying on with the REPL. Especially if I'm following a tutorial and switching back and forth this becomes irritating!