Allow External Diff Tool to be specified by file type


I like to use the built-in diff for code files because it's awesome, but for other file types either IntelliJ doesn't support diffing at all (such as Excel, which I use Araxis for) or has a size limit (very large text files). I can get by specifying a single non-default external diff tool, but hate getting the big grey window with "Can't show diff" in the middle and having to click the "Show diff in external tool" button (or use a custom keyboard shortcut).

It would be nice if you could specify a default external diff tool for a specific file type. 


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