fce731a175
This commit is intended to fully fix the problem described in https://developer.blender.org/T36425#19 (see also the previous commit rB08528f577dcb). Addition of a small offset (to avoid singularity in stroke rendering due to overlapping vertices) was not performed for all overlapping vertices. Removed the StrokeCleaner and related helper functions which were added as a temporary workaround in rB2a5b6d9c8f16.