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This has not been a problem in Java SE context, but since JavaFX Projects have the relative reference to RT artifacts added in Project Properties -> Libraries -> Compile, this tab's contents should be refreshed so as to show valid references any time Java Platform is changed.
Issue no longer valid, as the FX classpath extension mechanism has been changed (see Issue #229678); now there is no need to display explicit FX artifacts in Libraries->Compile, instead, a passive marker is shown informing that "javafx.classpath.extension" is present, whatever its internal definition is. This is also a cleaner solution: unlike the previous FX artifact references it cannot be deleted by user by mistake. Because of that the only past reason for a specific listener in Libraries->Compile has ceased to exist. Thus closing as wontfix.