IntelliSense: suggest definitions in not-yet-included file

Currently (please correct me if I'm wrong), it seems VSCode will not suggest definitions that are not yet included in the source file. This is despite the fact that the definitions reside in header files in includePath. Example below.

For instance, say I wanted to create an instance of std::map in my source file. I have not yet added #include <map> at the top of my source file.

In some other C++ IDEs, a code suggestion will appear for std::map when I start typing it (see NetBeans example below). If I choose to accept the suggestion, #include <map> is automatically added at the top of my source file.

In VSCode, however, I'm not getting this suggestion unless I add #include <map> first.

Suggestion: Enable IntelliSense to suggest definitions that are (not yet) included in the source file.
Automatically add #include (relevant header) when accepting such a suggestion.

Start by locating the IntelliSense completion and include-handling entry points in this repository; the issue names no files or tests. Done means suggestions can find definitions in configured headers not yet included and accepting one adds the relevant include.