SublimeText/Origami — pull request #58 by JonathanAquino (2014-02-26 03:46:50+00:00)
Title: Added a CreatePaneWithClonedFileCommand.

This allows people to split their window horizontally or vertically with a
single key binding. This behavior is found in jEdit: Command+2 splits the window vertically, and Command+3 splits the window horizontally.