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With Netbeans 8.0 along with JDK 8 in OS X + Emacs Key Binding, When I hit Command+R for renaming, the dialog come up without input focus. I found that it gets the focus when I hit Command+Tab twice which means I changing the front application and back to NetBeans.
Already fixed in NB 8.0. Please update to latest NB 8.0 build (patch1)