Atlantis Side Pane Fix

If the bug in the Brockerhoff split view library that crops up under Catalina affects you and your sidebar vanishes, and you cannot make it expand back out to visibility, there's a quick (but somewhat esoteric) way to fix it via Apple's preference configuration utility.

1. Quit Atlantis
2. Open /Applications/Utilities/Terminal.app
3. Type `defaults read net.riverdark.Atlantis | grep 'RBSplitView V'` - you should see one (or more) lines that are like "RBSplitView V lemuria_main" or "RBSplitView V lemuria_window:<some number>" and each will show it as being some esoteric value.
4. Find the line from the previous step that has a negative number in it, such as `"RBSplitView V lemuria_main" = "2 -17.5248 922"`
5. Change the negative number to a positive one, preferably larger than 140. For instance, `defaults write net.riverdark.Atlantis "RBSplitView V lemuria_main" -string "2 200 922"`
6. Type `defaults read net.riverdark.Atlantis | grep 'RBSplitView V'` again to make sure the change took.
7. Restart Atlantis. Your sidebar should have returned!

Yay!