Formatter: non-convergence wrapping a multi-line sum of long macros in a localparam #2547

verible-verilog-format fails to converge when a localparam is initialized to a sum of several long `MACRO identifiers written across lines. The first format pass puts each + and macro on its own line; the second pass joins the final + onto the last macro, so format(format(x)) != format(x).

Test case

module m;
  localparam N =
      `MACRO_GEN3_SCRAMBLE_LFSR_REGOUT
      + `MACRO_GEN3_SCRAMBLE_REGIN
      + `MACRO_GEN3_SCRAMBLE_REGOUT
      ;
endmodule

Actual output

Re-formatted text does not match formatted text; formatting failed to converge!  Please file a bug.