Xml Style - continuationIndent for attributes should align to tag name width

[nmck257]

What problem are you trying to solve?

Consider a small pom like this:

<?xml version="1.0" encoding="UTF-8"?>
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.sample</groupId>
  <artifactId>sample</artifactId>
  <version>1.0.0</version>
</project>

Observe the indentation (four spaces) of line 3.

If you pass a file like this through XML AutoFormat, you'll get that kind of indentation: continuation indents are 4 spaces by default.
But, if you run IntelliJ's autoformat, then it will indent like this:

<?xml version="1.0" encoding="UTF-8"?>
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.sample</groupId>
  <artifactId>sample</artifactId>
  <version>1.0.0</version>
</project>

On line 3, the content has been indented to 9 spaces, aligning with the first attributes of the line above after the tag name.

Describe the solution you'd like

Would be neat if there was an Xml Style / autoformat logic which supports this, and perhaps that should be the default style.

Have you considered any alternatives or workarounds?

Do nothing

Additional context

This indentation heuristic feels a bit unique? Not sure if implementing this would make a mess of the existing Autoformat / Style designs / interfaces.

Are you interested in contributing this feature to OpenRewrite?

I might, but, not a big priority. This might be a decent "first issue"?