Created attachment 250201 [details]
Test GIR file

When parsing a GIR file that has a double pointer vapigen should see that as an out parameter.  It doesn't, and so then generates the code incorrectly when trying to use that function.

Attached is a small GIR file to show the problem that is executed like:

$ vapigen --girdir=. --library=test-1.0 Test-1.0.gir

Doing that generates a VAPI with the function protoype:

public virtual void test_this (GLib.HashTable<void*,void*> hashtable);

instead of:

public virtual void test_this (out GLib.HashTable<void*,void*> hashtable);

This can seen in the GIO vapi file with MenuModel.get_item_links().