c_gtk_paper_size_new_from_key_file

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
GtkPaperSize* function(GKeyFile* keyFile, const(char)* groupName, GError** err) c_gtk_paper_size_new_from_key_file;

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