Comment
A comment is displayed within the editor or the Comments Panel, depending on how it is provided.
Properties
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                  The author information of the comment
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                  Context value of the comment. This can be used to contribute comment specific actions. For example, a comment is given a context value as editable. When contributing actions to comments/comment/title using menus extension point, you can specify context value for key comment in when expression like comment == editable.
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                  Comment mode of the comment
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                  Optional reactions of the Comment