matplotlib/matplotlib — pull request #803 by tonysyu (2012-03-28 01:15:06+00:00)
Title: Return arrow collection as 2nd argument of streamplot.

Return arrow patches so users can modify or remove them after calling `streamplot`. This was listed as a todo in the original implementation, but never actually done.

Maybe adding arrows to the axes should be delayed until the arrow collection is completely populated (and then the collection can be added to the axes all at once, just like the streamline collection)?