Consider ampersand in queries

[willmcgugan]

It may be nice to add a syntax to queries which refers to the current widget.

For instance, if I want to get the immediate child of a widget, I could do this:

self.query("& > Child")

Currently that's rather awkward to implement.

We can also extend this to the CSS itself. i.e. ini a CSS or DEFAULT_CSS. For instance the following would style the widget without the need to specify its type again:

DEFAULT_CSS = """
& { border: heavy red}
"""

Currently, you have to do this:

DEFAULT_CSS = """
MyWidget { border: heavy red}
"""

[davep]

Closing as this was implemented as part of nested CSS.

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[davep]

Ignore that, reopening as this is different from nested CSS (was only half reading).