I saw some settings the other day that I’m finally trying out. If you set
Product → Debug Workflow → Xcode Always In Front
Xcode will become a small mini-player, until you hit a breakpoint, then it will expand so you can step through. Nothing you do in Xcode will give it focus* so the Quicksilver interface won’t get dismissed.
Hope that helps someone.
* the name of the setting seems backwards
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Rob McBroom
<http://www.skurfer.com/>