Plugin generates new files despite the inputFiles are not changed since the last generation

[kurtinaitis]

Description

Plugin generates new files despite the inputFiles are not changed since the last generation.
It takes too much time for subsequent generation/compilation which has to be prevented by gradle/plugins.

To Reproduce:

Run $ ./gradlew generateSwaggerCode several times and observe that it generates files on every run. It takes about the same time to finish.

Expected behavior:

Plugin checks if the generated files are newer than the input file and then skips generation.

Environment

Plugin version: 2.19.1
Swagger Codegen version: 3.0.32
Gradle version: 5.3.1
Java version: openjdk 11.0.13 2021-10-19
OS: linux mint 20.3