fix quote within quotes formatted incorrectly by fmt #7045
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Fixes #6998 by looking for `" and "` patterns. If the first quote character is encountered before the second one, then the second character is treated as quoted and the outer quote block ends there. If the second character is encountered before the first, then the inner quote is considered closed, but the other one is not closed. So after the second " in `"" we are still in backtick block. For `"` we are not within any quote block after the last `