BackgroundImage does not work with many filters
Gaussian blur requires a larger area than just the area shown to render correctly. This mostly (if not always) works when blurring an object directly, but when using BackgroundImage too small an area is given to the blur filter. See the attached files, one uses BackgroundImage, the other use in combination with a mask, the first is rendered with discontinuities, the other is rendered just fine.
- BackgroundImage does not work with Gaussian blur
+ BackgroundImage does not work with many filters