Removes comment characters that are specific to the current language from the selected text (see also SelectLanguage) . The selected text must begin with comment-start symbols and end with comment-stop symbols in order for UnCommentBlock to work. Otherwise, it will do nothing. If correctly commented, UnCommentBlock applies the following rules to the selected text:
This command should "undo" a CommentBlock and is useful for uncommenting old comment blocks in later sessions.
If there is no selection, CommentBlock treats the current line as the selection.