stderr not consistently colored

[Bill Allombert <allomber@math.u-bordeaux.fr>]

Hello PARI dev,

stderr colors are not consistants.  Try the following

? \g4
? default(colors,"1, 5, 3, 5, 6, 2, 3")
   colors = "1, 5, 3, 5, 6, 2, 3"
? factor(2^64+1,0)
IFAC: cracking composite
        67280421310721
IFAC: checking for pure square
IFAC: checking for odd power
  ***   Warning: IFAC: unfactored composite declared prime.
IFAC: prime 67280421310721
        appears with exponent = 1
IFAC: main loop: this was the last factor
IFAC: found 1 large prime (power) factor.

IFAC is not consistently colored.

Cheers,
Bill