Replace GradleClasspathContainer on project only if content changed #369
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This pull request fixes the problem that on each synchronization the GradleClasspathContainer is replaced on the project, although there are no changes. This issue caused on big projects unnecessary incremental builds, because the project description is marked as changed after the classpath container is replaced. See also Gradle discussion [1].
Eclipse internal checks if the old classpath container differs from the new classpath container [2]. Therefore the fix only implements the equals() and hashcode() of the GradleClasspathContainer to fix the problem.
[1] https://discuss.gradle.org/t/classpath-container-update-on-synchronization/21499
[2] org.eclipse.jdt.internal.core.SetContainerOperation.executeOperation()