quiver: always recalculate in draw(); improve docstring; closes #3709, #3817 [backport to 1.4.x] #4034
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This PR adds a test for #3817, which is fixed by the change to draw(). The docstring addition addresses #3709. It is not clear why the unconditional recalculation in draw() is needed now, but was not needed in v1.4.0.