Duplicate root element for projects in subfolder

[CsCherrYY]

given two Gradle projects:

• https://docs.gradle.org/current/samples/zips/sample_building_java_applications_multi_project-groovy-dsl.zip
• https://docs.gradle.org/current/samples/zips/sample_building_java_applications-groovy-dsl.zip

extract them to one folder, e,g.,

• testFolder/sample_building_java_applications_multi_project-groovy-dsl
• testFolder/sample_building_java_applications-groovy-dsl

and open testFolder in VS Code, an error will disappear:

Could not run phased build action using connection to Gradle distribution 'https://services.gradle.org/distributions/gradle-7.5.1-bin.zip'.
java.lang.IllegalArgumentException: Duplicate root element demo
Duplicate root element demo

[CsCherrYY]

we can reproduce this via: https://github.com/spring-guides/gs-testing-web, since we now support scan two levels of the project.