A C++ call written with no receiver, or through `this->`, inside a method
was matched by its name alone, so another class's method of that name won
by file proximity: protobuf's generated `Api::operator=` calling
`InternalSwap(&from)` reached `Any::InternalSwap`, `Any::InternalSwap`'s
inherited `GetArena()` reached `Arena::InternalHelper::GetArena`, and
googletest's `~linked_ptr() { depart(); }` reached `linked_ptr_internal::depart`.
matchMethodCall now resolves C++'s implicit `this` the way it resolves a
typed receiver: the calling method's class, then the classes it derives
from (its own base edges, through #2440's cppMethodOf), then the classes it
is nested in, with the overload the arguments fit. The call's shape is read
at its column (the extractor drops `this->` and some receivers it can't
spell). A free function, a parameter or local of the name, a dependent base
reached by a bare call, a namesake class in another translation unit and a
member a macro may declare all leave the call to the name strategies.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Colby Mchenry