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In the Snippet Editor, you can add the same keyword twice. "Adding" an existing keyword should either be prevented in the "Enter new keyword" dialog or simply result in no effect. (Personally, I prefer the former solution, as it's less surprising to the user.)
https://git.eclipse.org/r/#/c/24907/ Now the input dialog checks whether the user input already exists in the list of keywords or not. If it already exists the user isn't able to add his input it.
Fixed merged a while ago. @Olav: If you submit a change in Gerrit, please don't hesitate set the associated bug to RESOLVED. (FYI, there's always a second step involved setting it to CLOSED to mark that it stood up to real-world usage.)
Closing for 2.1