filter/f_fixhtml

Is a minimal tag balancer (a highly simplified HTML tidy) and can
work around various html code problems that the ewiki_format()
html rendering function has. It is for example specialized to
correct broken html that resulted from WikiMarkupAbuse+ as for
example nesting text style attributes like this:  text

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You cannot modify the README.plugins file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the README.plugins.Discussion.