mono/MonoGame — pull request #2678 by jamesford42 (2014-06-07 00:42:32+00:00)
Title: PipelineTool undo/redo

Implemented undo/redo for the following actions:
Adding a ContentItem
Removing a ContentItem
Creating a ContentItem
Editing a ContentItem property.

Still missing:
Editing a PipelineProject property.