Commits on Dec 7, 2019

1. Manually implement FFI code for GObject instead of using glib_shared_… …

   …wrapper!
   
   This way we can implement special cases more correctly:
   - g_value_get_boxed() is invalid for GObjects
   - Debug impl can print the actual type
   - Only from_glib_none() will ever steal floating references and e.g.
     cloning does not, see #545
   
   After this the only places where we would steal floating references from
   C code would be when explicitly calling from_glib_none() somewhere. That
   is, when we call a function and get a (transfer none) reference to an
   object back. (transfer floating) is an alias for this.
   
   Especially, cloning and from_glib_borrow() would never steal floating
   references, and because of this it is very important to only ever use
   from_glib_borrow() inside callbacks, signal handlers and virtual method
   trampolines.

   

   sdroege committed Dec 7, 2019
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2. Make FloatingReferenceGuard a no-op …

   Once all crates are updated this struct should be completely removed.

   

   sdroege committed Dec 7, 2019
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3. Don't steal floating references in ObjectSubclass::get_instance()

   

   sdroege committed Dec 7, 2019
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