It would be nice to have an option to only index files listed in the "external directory" that have an #include<...> directive. This would reduce the amount of indexed files to only index files used in context.
I'm not sure if this is a good idea - also files without the include directive may contain symbols you might be interested in. It would also require pre-parsing the files for include directives, is specific only to C/C++ so this is probably something I won't implement.
Closed #900.
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