Is Cygwin X server causing ubuntu eclipse to copy to the clipboard on selection?

[David Karr <davidmichaelkarr at gmail dot com>]

I run Eclipse on win7, and also Eclipse on Ubuntu, displaying the
window on my Win7 box, using Cygwin.

One annoyance I have with the latter is that when I select a region of
text, it appears to automatically copy that region to the clipboard,
instead of waiting for me to press Ctrl-C.

I asked about this on the eclipse forums, and they said Ubuntu Eclipse
doesn't do this, and it's likely being done by my X server.

I checked the Cygwin-X11 FAQ and the command-line options, and I don't
see anything that specifies this.

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