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Recompiles even if there is no changes

See original GitHub issue

steps

mkdir -p test/project
cd test
echo "sbt.version=1.0.1" > project/build.properties
echo "addSbtPlugin(\"com.eed3si9n\" % \"sbt-buildinfo\" % \"0.7.0\")" > project/plugins.sbt
echo "enablePlugins(BuildInfoPlugin)" > build.sbt
mkdir -p src/main/scala
echo "object Test {}" > src/main/scala/Test.scala
sbt ~test:compile
[info] Loading settings from idea.sbt ...
[info] Loading global plugins from /Users/joangoyeau/.sbt/1.0/plugins
[info] Loading settings from plugins.sbt ...
[info] Loading project definition from /Users/joangoyeau/Code/test/project
[info] Loading settings from build.sbt ...
[info] Set current project to test (in build file:/Users/joangoyeau/Code/test/)
[info] Compiling 2 Scala sources to /Users/joangoyeau/Code/test/target/scala-2.12/classes ...
[info] Done compiling.
[success] Total time: 5 s, completed 08-Sep-2017 14:26:50
1. Waiting for source changes... (press enter to interrupt)
[info] Compiling 2 Scala sources to /Users/joangoyeau/Code/test/target/scala-2.12/classes ...
[info] Done compiling.
[success] Total time: 1 s, completed 08-Sep-2017 14:26:57
2. Waiting for source changes... (press enter to interrupt)
[info] Compiling 2 Scala sources to /Users/joangoyeau/Code/test/target/scala-2.12/classes ...
[info] Done compiling.
[success] Total time: 1 s, completed 08-Sep-2017 14:27:06
3. Waiting for source changes... (press enter to interrupt)
[info] Compiling 2 Scala sources to /Users/joangoyeau/Code/test/target/scala-2.12/classes ...
[info] Done compiling.
[success] Total time: 1 s, completed 08-Sep-2017 14:27:16
4. Waiting for source changes... (press enter to interrupt)
[success] Total time: 0 s, completed 08-Sep-2017 14:27:16
5. Waiting for source changes... (press enter to interrupt)
[info] Compiling 2 Scala sources to /Users/joangoyeau/Code/test/target/scala-2.12/classes ...
[info] Done compiling.
[success] Total time: 1 s, completed 08-Sep-2017 14:27:26
6. Waiting for source changes... (press enter to interrupt)