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There's already an existing feature for showing whitespace characters, such as spaces, tabs, line breaks, etc. Unfortunately, this list does not include zero-width whitespace characters (\u200b), which can't be usually seen. If a code contains such characters, it may be hard to determine the cause. I propose adding a new configuration option for configuring the visibility of zero-width whitespaces under the General -> Editors -> Text Editors -> Show whitespace characters -> Configure visibility. A replacement character would be \u2588.
See also https://github.com/eclipse-platform/eclipse.platform.ui/issues/1002