Compatibility with Gradle 8

[ljacomet]

The following code is an issue with upcoming Gradle 8:

gradle-wartremover/src/main/groovy/cz/augi/gradle/wartremover/WartremoverPlugin.groovy

Lines 7 to 25 in d783941

	class WartremoverPlugin implements Plugin<Project> {
	@Override
	void apply(Project project) {
	def extension = project.extensions.create('wartremover', WartremoverExtension)
	project.afterEvaluate {
	project.dependencies { scalaCompilerPlugins "org.wartremover:wartremover_${getWartremoverArtifactSuffix(project)}" }
	project.tasks.withType(ScalaCompile).configureEach { scalaTask ->
	if (scalaTask.scalaCompileOptions.additionalParameters == null) {
	scalaTask.scalaCompileOptions.additionalParameters = new ArrayList<String>()
	}
	WartremoverSettings settings = scalaTask.name.toLowerCase().contains('test') ? extension.getTest() : extension
	scalaTask.scalaCompileOptions.additionalParameters.addAll(settings.errorWarts.collect { getErrorWartDirective(it) })
	scalaTask.scalaCompileOptions.additionalParameters.addAll(settings.warningWarts.collect { getWarningWartDirective(it) })
	scalaTask.scalaCompileOptions.additionalParameters.addAll(settings.excludedFiles.collect { getExludedFileDirective(project.file(it).canonicalPath) })
	scalaTask.scalaCompileOptions.additionalParameters.addAll(settings.classPaths.collect { getClasspathDirective(it) })
	}
	}
	}

Gradle made the additionalParameters list immutable, so you have to copy, add and then set it to make changes to it.

I'll open a PR that does just that.