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In Mac OS X Mountain Lion at least, if you Option+click ( Alt+click ) on another a window of another app, this will make the other application to gain focus, and the current app to be hidden as if you'd pressed Command+H.

Is there any way to disable this behaviour? Perhaps with some defaults write like command entered in a terminal?

I'd like to use Option+click for some different behaviour (moving windows by Option+clicking and dragging anywhere on them, using a third-party tool, Zoom2), and having Option+click trigger the hiding behaviour instead is very inconvenient.

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You may be able to pass the option-click to a background window by also pressing command. If that actually works with your windowing-tool depends on how cleanly that is implemented. – MacLemon May 28 '14 at 0:49

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