fix remove_extra_brackets undoing work of post-processing step

src/syntaxer.cpp

@@ -709,6 +709,12 @@ static void remove_extra_brackets(std::vector<Expression::Token>& tv)
 				continue;
 			}
 
+			// check specifically if the opening undoes applied fixes
+			if (Expression::Token::is_negative(get_prior_mop(tv, get_mop_location(tv, r.start))))
+			{
+				continue;
+			}
+
 			open_brackets(tv, r);
 		}
 	}