Fix misusage of unite(), it's const, doesn't change the object

Review Request #123618 - Created May 3, 2015 and submitted

Information
Sergio Martins
kwin
master
Reviewers
kwin

unite() is a trap. It's a no-op if we don't use the result.

Posting a review since I didn't do any testing and have no idea how to test.

Thomas Lübking
Sergio Martins
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit e283bda8e5e5c83dcbd0f31adb3007182e72960f by Sergio Martins to branch master.
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