GIMP 2.7.3 adds Single Window Mode

“GIMP 2.7.3 has added one of the most requested features in the
program’s history: a single window mode. Version 2.7 is part of the
development branch, so unfortunately, the feature wont hit most
distro repositories for a while.

As I said, because 2.7 is a development branch, most
distributions won’t add it to their repositories, and this means
that you’ll have to build it yourself. It’s a shame, in a way,
because the new window mode might be viewed as a ease of use
feature that less advanced users would appreciate. According to
this page, it looks like version 2.8 should arrive in about
November.

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