Improve CodeAction "Insert only required expected elements" by taking care of choice

[angelozerr]

Given this XML file:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-model href="http://www.tei-c.org/release/xml/tei/custom/schema/relaxng/tei_all.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>
<TEI xmlns="http://www.tei-c.org/ns/1.0">
	<teiHeader>
		<fileDesc>
			<titleStmt>
				<title></title>
			</titleStmt>
			<publicationStmt>
				<publisher></publisher>
			</publicationStmt>
			<sourceDesc>
				<p></p>
			</sourceDesc>
		</fileDesc>
	</teiHeader>
	<text>

	</text>
</TEI>

As text element can hosts several element kind (addSpan, etc), it should be nice to provide a code action per possible element to generate the content of text.