Seems kind of arbitrary to use `.hpp` over the number of other extensions people use for C++ headers. Likely `.h` was chosen because it's the most common extension for C++ headers, at least historically.
If you remove [the `*.h` from the `C` key in `filetype_extensions.conf`](https://github.com/geany/geany/blob/master/data/filetype_extensions.conf#L13) it will treat them as C++ files and you'll get proper highlighting and symbols for `.h` files. I do this here and it works great for both C and C++ headers, except that it wrongly highlights `namespace` and `class` and such in C headers, but I never use those in plain C headers anyway.
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