Fix the trapezoidal hole in the unicorn's head
As an unintended consequence of recent changes in the "Fill between" LPEs, the rendering of some test SVGs has been broken. As an example, this results in an undesireable trapezoidal hole in the head of the "Autumn Gaze" unicorn, as reported in #3348 (closed).
Additionally, we fix the severe lag that occurred when an object with this LPE was dragged and stamped – issue #3354 (closed).
This MR is a collaboration with @nathanal.
Fixes #3348 (closed) | Fixes #3354 (closed)
Edited by Rafał Siejakowski