[Jts-topo-suite-user] Robustness issue in BufferOp

Hi Martin,

Hereafter, a robustness problem found with a valid geometry
and a buffer of 5.0 used with JOIN_MITRE option and the default
quadrant segments number.

Note that the polygon has colinear segments and applying
a DP simplification with tolerance 0 solve the problem.

POLYGON ((
         383815.6 6518617.1,
         383815.6 6518617.2,
         383815.7 6518617.3,
         383815.8 6518617.3,
         383815.8 6518617.4,
         383815.9 6518617.5,
         383816.0 6518617.5,
         383816.0 6518617.6,
         383816.1 6518617.6,
         383816.2 6518617.6,
         383815.6 6518617.1
     ))

Keep the good work,

Michaël