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We can bring this back, but we still need to hookup the editor part
that will auto-display the new buffer.

We don't need this now that we can mux actions from perspectives.
Just add the action groups to your perspective and that should be
enough to make things work.

.2 isn't coming out until sometime near the freeze.

We can easily set a fallback which means we don't have to be
so careful going forward.

The meson in the SDK is newer than this, and we need that.

In .ui files, we need to handle node with no
'name' attribute yet.

In node parsing main loop, we need to be sure that
the node exist before changing its value.

If the file is recognized as a gtk builder file,
the corresponding gtkbuilder.rng file from gresources
is automatically added.

We need to adjust the optionality on some
rng strcutures when we have existing attributes
in the current node.

The parser now use a two phases algorithm:
1. We check the rng attribute position in the node and
   propagate a mandatory field. this way we can transform for example
   an Optional into a Group.

2. We walk the tree to add the matching attributes.

We also introduce a filter to remove duplicates and sort
the proposals by alphabetical order.

We remove the unused stack

If we examine one more time the group, we need
to reset the define pointer to the group start

Now we get some proposals for elements and attributes

We now have detail_name and detail_value
like in attribute name and value.

We also have 'quote' to indicate the attribute value
quoting style ( ' or " )

For now, the main use is identifying if
a node is closed or not.

We add some new members:
- prefix: name of a partial element node
- child_node: partial node
- detail: position in an element node

We now get the cursor position as an in-between node position
when we are in the content of a node.