Even the Cloth Brush grab works like a regular grab brush, it makes sense to support spacing just in this brush in order to prevent creating more brush steps that update the simulation. This way, it is possible to create grab brushes that update the simulation constantly while grabbing (using the dots stroke mode) or brushes that only update the simulation when the cursor moves (using spacing). Reviewed By: sergey Differential Revision: https://developer.blender.org/D8568