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It seems that indentation produced from rich strings is easily confused if the sources contain a mix of single space characters and tabs. Unfortunately, the warnings and quickfixes typically appear in wrong positions in this case. While ideally I would wish that invisible differences don't make a difference I can imagine this to be quite hard. To help in this situation I suggest to enable "Show Whitespace Characters" in xtend2 editors by default. If possible this should be done without affecting other editors.
Although I agree that it usually makes sense to enable whitespace when editing rich strings in Xtend, the show whitespace option is a general text editor preference. I don't think that we should make this different for Xtend editor only. I'm not aware of any other code editor that allows this configuration independent from workspace preferences.