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Presentation 3<br/> Bug 434, [https://githubdocs.com/mbuttu/butter/commit/9c14837ff694708fd6b74abae6a87ee71a07336f drag and drop]<br/>Bug 458, [https://githubgoogle.com/mozillapresentation/butterd/pull1iBHU5VREqeVM5cMRwtesdksmSaj4SjGgo6l66JgHXuw/97/files protect from invalid times in track eventsedit Presentation 4]<br/>Bug 493, [https://github.com/mozilla/butter/pull/98/files focus the window]<br/>Bug 463, undo/redo backend<br/>* [https://github.com/mozilla/butter/pull/119/files pull request]* [https://github.com/mbuttu/butter/compare/undomanager changes for feedback]* [https://webmademovies.lighthouseapp.com/projects/65733/tickets/463-implement-undoredo-backend#ticket-463-3 lighthouse discussion]* [https://webmademovies.lighthouseapp.com/projects/65733/tickets/281 #281 undo/redo buttons]* [http://jsfiddle.net/mbuttu/VQXck/15/ jsfiddle]
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