baseline-idea: Gradle IntelliJ integration results in infinite growth of .idea/checkstyle.xml file

[iamdanfox]

What happened?

I'm trying to improve the IntelliJ integration and I just noticed this weird behaviour. A bulletproof way to reproduce it is:

1. pick a repo that uses baseline-idea, and temporarily edit the .gitignore file so that git tracks IntelliJ's files:

# IntelliJ
# *.iml
# *.ipr
# *.iws
# .idea/
out/

2. run git clean -xdf and then commit everything.
3. Run ./gradlew idea, and import into IntelliJ as normal (using "Import Gradle project)
4. Hit the Reload All Gradle Projects button as much as you like:

If you look at your git diff, you'll see the .idea/checkstyle-idea.xml file is just growing and growing:

  <component name="CheckStyle-IDEA">
    <option name="configuration">
      <map>
        <entry key="active-configuration" value="LOCAL_FILE:$PROJECT_DIR$/.baseline/checkstyle/checkstyle.xml:Baseline Checkstyle"/>
        <entry key="checkstyle-version" value="10.3.1"/>
        <entry key="check-nonjava-files" value="false"/>
        <entry key="check-test-classes" value="true"/>
        <entry key="location-0" value="LOCAL_FILE:$PROJECT_DIR$/.baseline/checkstyle/checkstyle.xml:Baseline Checkstyle"/>
        <entry key="suppress-errors" value="false"/>
        <entry key="thirdparty-classpath" value=""/>
        <entry key="property-0.samedir" value="$PROJECT_DIR$/.baseline/checkstyle/"/>
      </map>
    </option>
  </component>

What did you want to happen?

Ideally repeatedly importing a project into intellij wouldn't result in any unbounded growth / minimal modifications. I don't really know if this is causing any problems per-se, just thought it was weird and wanted to write it down.