infinite rendering loop of SYMBOL defined with GAP using with SIZE 0

[szigeti]

program stucks in drawPolylineMarkers if a LINE of SYMBOLS is drawn with SIZE 0 and with GAP keyword in the SYMBOL:

 LAYER
[...]
  CLASS
   [...]
   STYLE
    SYMBOL 'POTTY'
    COLOR 180 180 220
    SIZE 0
   END
  END
 END
[...]

with

 SYMBOL
  NAME 'POTTY'
  TYPE ELLIPSE
  POINTS 1 1 END
  GAP 1
  FILLED TRUE
 END

infinite loop. But

 SYMBOL
  NAME 'POTTY'
  TYPE ELLIPSE
  POINTS 1 1 END
#  GAP 1
  FILLED TRUE
 END

_no_ infinite loop, normal execution!

Well, it's clear, that computationally it is not a bug - if Y = X + n*STEP and STEP=0 then n must be infinitely big... but maybe it isn't much work to handle this special (skip drawing) case internally.

Negative SIZE values seem to have the same problem.

[tbonfort]

this should not occur in 6.0, we do not enter the msImagePolylineMarkers if the spacing is <=0.