The classpath container in the .classpath file currently references the name of the project that the container belongs to. E.g.
(see the reference to "someProject").
This is unnecessary, because the classpath container is always attached to the project it is defined for, the there is no need to explicitly remember the project.
Furthermore, it causes problems when a project is renamed, because the classpath container will not be updated and then reference the wrong (old) project.
And last, not saving the project eases copy&pasting of the classpath container entry from one .classpath file to another (no need to click in all those dialogs then).
I'll attach a patch that removes the saving of the project. The loading is kept at it is.