Comment 4 for bug 1246550

I have to partially revert my earlier review:
With both patches, it seems that the helper paths are sometimes duplicating paths already drawn with other methods:
- Path effects like Bend, Envelope have both the helper paths (blue here), and the parameter paths (green here) drawn on top of each other.
- Path effects like Hatch, Extrude paint helper paths along the result path of the effect, again doubling existing lines (0.47 did this too, for the Hatch LPE).

Both types of 'double-drawing' can be easily observed because of the delayed update of the (blue) helper paths.

Not sure whether this is intended, or a side-effect?