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occasional unexpected long lines. 1. The Parameter Editor mode was extended to prevent strokes from doing quick U-turns that "enable" a known bug in strip creation that generates unexpected long lines in question. 2. A verbose warning message was added to make the existence of the strip creation bug visible to users. When the bug affects the stroke rendering, the following warning shows up in the console: > Warning: problem in strip creation (the strip is most likely doing a U-turn). 3. The extrapolation option of CurveMapping (used in alpha and thickness modifiers in the Parameter Editor mode) was identified as another source of unexpected long lines. Now the extrapolation option is unconditionally disabled (even when users enable it through the GUI).