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LSP4E and LSP4J - CDT's dependencies - have made this change and that causes API breaking changes throughout the code base. See https://github.com/eclipse/lsp4j/blob/master/CHANGELOG.md
Gerrit change https://git.eclipse.org/r/156769 was merged to [master]. Commit: http://git.eclipse.org/c/cdt/org.eclipse.cdt.git/commit/?id=15e569164cc34a1752fa2bb4369571af325eb88f