I like snapping my app windows with the Magnet app. MailSpring is the only app that can no longer snap or orient, see screenshot above. All of the options are greyed out whereas the other apps are still able to snap correctly.
I have the same issue…
It might also be useful to note that this is the only electron based app that I have that suffers from this issue, so it seems to be something Mailspring specific
im using mailspring 1.5.5, magnet 2.4.1 on osx 10.14.2 (18C54)
I use Mailspring 1.5.5 and Magnet 2.4.2 on MacOS Mojave 10.14.2 and I cannot reproduce this issue. I use my keyboard shortcut Ctrl+Option+Arrow to snap Mailspring to either side of my screen without issue.
Edit: after a reboot, Magnet no longer works with Mailspring. When I open Magnet, the Window control options are not selectable.