63b5c9ea2b
It seems that a `Glib::ConvertError` is thrown, and then the function that catches the error causes another ConvertError in `err.what()` (which presumably include the filename that causes the error). relevant part of the backtrace (macOS Crashdump): ``` Glib::ConvertError::throw_func(_GError*) + 56 Glib::Error::throw_exception(_GError*) + 292 Glib::operator<<(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, Glib::ustring const&) + 131 StringPrivate::Composition& StringPrivate::Composition::arg<Glib::ustring>(Glib::ustring const&) + 25 std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > string_compose<Glib::ustring> (...) + 81 PBD::run_functor_for_paths(...) + 1313 ```
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