Frame for opening rgrep links?

[Nikolaus Rath]

Hello,

I typically use Emacs with two frames, one "regular" frame and one
opened by ecb.

Until a little while ago, running M-x rgrep in the ecb frame and
clicking on one of the matches in the *grep* buffer opened the file in
the same (ecb) frame.

Recently, however, emacs has started to open the file in a different
frame, i.e. the ecb frame keeps showing the *grep* buffer. 

I am a bit lost as to what may have caused this, or how I can change it
back.

Anyone able to help?

Best,
-Nikolaus

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