Previously, at two places (in g_object_real_dispose() and shortly before
finalize()), we would call
g_datalist_id_set_data (&object->qdata, quark_weak_notifies, NULL);
This clears @quark_weak_notifies at once and then invokes all
notifications.
This means, if you were inside a notification and called
g_object_weak_unref() on the object for *another* weak-reference, then
an exception failed:
GLib-GObject-FATAL-CRITICAL: g_object_weak_unref_cb: couldn't find weak ref 0x401320(0x16b9fe0)
Granted, maybe inside a GWeakNotify you shouldn't call anything on
where_the_object_was. However, unregistering things (like calling
g_object_weak_unref() should still reasonably work.
Instead, now remove each weak notification one by one and invoke it.
https://gitlab.gnome.org/GNOME/glib/-/issues/1002
g_object_weak_ref() documentation refers to GWeakRef as thread-safe
replacement. However, it's not clear to me, how GWeakRef is a
replacement for a callback. I think, it means, that you combine
g_object_weak_ref() with GWeakRef, to both hold a (thread-safe) weak
reference and get a notification on destruction.
Add a test, that GWeakRef is already cleared inside the GWeakNotify
callback.
Add SPDX license (but not copyright) headers to all files which follow a
certain pattern in their existing non-machine-readable header comment.
This commit was entirely generated using the command:
```
git ls-files gobject/tests/*.[ch] | xargs perl -0777 -pi -e 's/\n \*\n \* This library is free software; you can redistribute it and\/or\n \* modify it under the terms of the GNU Lesser General Public/\n \*\n \* SPDX-License-Identifier: LGPL-2.1-or-later\n \*\n \* This library is free software; you can redistribute it and\/or\n \* modify it under the terms of the GNU Lesser General Public/igs'
```
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Helps: #1415
