Pane is not split under Atom1.19.0-beta1 (again)

[jerrykal]

As the title.

[mupchrch]

Hm it's splitting for me, but I can't scroll the right editor.

[jerrykal]

I've find out the problem is minimap-selection.

[mupchrch]

I think my latest commit will fix the issue. Please reopen if the update I push out in a few minutes doesn't help your situation.