Blender Git Loki

GPencil: Display stroke filling while drawing

Before this change, the stroke was filled only after complete the stroke drawing. For artist is better to get a feedback of the area he is filling while drawing, so this commit draws the filling area while drawing.

The triangulation of the stroke is recalculated every time the function is called because using a cache is not useful because the points information is changing all the time while the stroke is being drawing.