This commit is an improvement in the previous fill tool
changes in order to improve how the extended strokes
are managed.
* Now, the algorithm checks if the extend cross a standard stroke, not only extend strokes.
* Option to enable or disable the stroke cross checking
because this can be slow in very complex scenes.
* Added `D` key to toggle stroke cross option.
* Option to use only collide strokes to be used as fill limit.
If the option to use only collide strokes is enabled, the
open extensions are in different color.
* Status text now shows mode and the actual extend factor.
This commits also contains a refactor of the loops
to use arrays as much as possible.
Reviewed By: mendio, pepeland
Differential Revision: https://developer.blender.org/D16052
fe19de5fcc