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by dchest 5473 days ago
Xcode had [mostly] single window mode since 2.0 or so. It wasn't default, though, and Interface Builder was a separate application.
2 comments
dchest 5472 days ago
For downvoters: Xcode 3 > Preferences > General.

Layout: All-In-One

"This layout provides virtually all operations within a single window, such as editing files and project content, filtering in the detail view, viewing the build results and build log, and debugging".

http://i.imgur.com/uW3SI.png

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bonch 5472 days ago
It wasn't a true single window mode; there were still secondary windows, and Interface Builder was not integrated.
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