Haihua Hu 5e8a650130 gleffects: fix little rectangle that appears at the center of squeeze and tunnel effects
These two shader will calculate the vector length and use it as denominator.
But length could be zero which will cause undefine behaviour. Add protection for
this condition

https://bugzilla.gnome.org/show_bug.cgi?id=767635
2016-06-15 19:18:15 +10:00
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