org.eclipse.lemminx.dom.DOMNode.getTextContent() seem to be implemented wrong (or incomplete)

[laeubi]

org.eclipse.lemminx.dom.DOMNode.getTextContent() always return null if Eclipse is correct no class overrides DOMNode here

https://github.com/eclipse/lemminx/blob/744de35767bf762a6abcfd2337f7e931ecbaf8d1/org.eclipse.lemminx/src/main/java/org/eclipse/lemminx/dom/DOMNode.java#L829

that simply return the value of an element while the javadoc says

ELEMENT_NODE, ATTRIBUTE_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, DOCUMENT_FRAGMENT_NODE
concatenation of the textContent attribute value of every child node, excluding COMMENT_NODE and PROCESSING_INSTRUCTION_NODE nodes. This is the empty string if the node has no children.

For the following example document

<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>test</groupId>
	<artifactId>bnd-integration-test</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>BND-M2E Integration Test Project</name>
	<description>This project test the BND-m2e integration</description>
	<build>
		<plugins>
			<plugin>
				<groupId>biz.aQute.bnd</groupId>
				<artifactId>bnd-maven-plugin</artifactId>
				<version>7.0.0</version>
				<executions>
					<execution>
						<id>bnd-process</id>
						<goals>
							<goal>bnd-process</goal>
						</goals>
						<configuration>
						<bnd>
						ssss
						<test>me</test>
						<![CDATA[ 
						  
						]]>
						</bnd>
						</configuration>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>
	<dependencies>
		<dependency>
			<groupId>org.osgi</groupId>
			<artifactId>osgi.core</artifactId>
			<version><![CDATA[8.0.0]]></version>
		</dependency>
	</dependencies>
</project>

I get the following output for element <bnd>

Okt. 27, 2024 3:07:58 PM org.eclipse.m2e.lemminx.bnd.BndLemminxPlugin$1 onXMLContent
INFORMATION: text content=null
Okt. 27, 2024 3:07:58 PM org.eclipse.m2e.lemminx.bnd.BndLemminxPlugin$1 onXMLContent
INFORMATION: substring=<bnd>
						ssss
						<test>me</test>
						<![CDATA[ 
						  
						]]>
						</bnd>

while the text content has to be something like

						ssss
						me

						  
						

[angelozerr]

Any contribution are welcome!