multiple headers in autocomplete when matches different paths

sometimes the same header can be found in different locations: e.g. a header can be found via an explicit include path (for a bundled 3rdparty library) and as os-provided header in the sysroot. in this case, the compiler (and the clang-based code navigation) selects one of the files depending on the include directories argument (compare attached screenshot with vendored and os-installed boost.asio for example)

however the qtcreator autocomplete popup will list two entries. while this is more of a cosmetic issue, it limits the space in the popup to less entries. it might be worth to de-duplicate the autocomplete popup to only unique headers