ProcessResources stays UP-TO-DATE even though the files to process have changed

[TWiStErRob]

Expected Behavior

After repro, tests fail because the content of the file changed due to it being processed now.

Current Behavior

After repro, test pass, same as in step 2, even though the contents of b.txt on the classpath should've changed, which means the expectation in the test is wrong and should fail.

gradlew cleanProcessResources test makes it fail correctly, but as we know "if you need to clean something, there's a bug in the build".

Context (optional)

Note: this looks eerily similar to #861, but it's a different issue, in this issue the files to process changes, not the contents of the properties.

Steps to Reproduce

1. Clone https://github.com/TWiStErRob/repros/tree/main/gradle/processResources-filesMatching_up-to-date
2. gradlew test - passes
3. Change build.gradle.kts: uncomment the line "**/b.txt"
4. gradlew test - observe pass/fail

Gradle version

6.5.1 (tried), 7.6.1 (tried), 8.0.2 (in repro)

Build scan URL (optional)

No response

Your Environment (optional)

No response

[ljacomet]

Does it work with 7.6.1?

[TWiStErRob]

Yep reproes on 7.6.1 too, and reproes 6.5.1 too (needs some downgrades to DSL).

[jbartok]

Thank you for providing a valid reproducer.

The issue is in the backlog of the relevant team but this area of Gradle is currently not a focus one so it might take a while before a fix is made.