..is cmd-opt-F7 (in Mac)
CMD OPT-F7 displays a list of usages of the currently item (var/method) throughout the project, listing them in a nice inline dropdown list. This is great for navigating around the usages of a method finding how they are used in context, before applying an aggressive refactoring. I discovered the short cut recently while performing one of the other find usages options in Intellij (cmd-F7) and getting fat fingered and hitting CMD-OPT F7.
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