734920 - Add a comment to anim-use-length-02.svg explaining what it's testing

Status: NEW

(Core :: SVG, defect)

Description

[Jonathan Watt [:jwatt]]

anim-use-length-02.svg could really do with a comment explaining that setting width/height to zero disables rendering of a <use>, and that the test is checking that rendering is un-disabled at the end of a <set> animation that has set width/height to zero.

Given that the <use> is referencing a <g>, its really easy to miss/forget that width/height actually _do_ have an affect in the special zero value case. I just spent a good 10 minutes totally misunderstanding what this test is trying to do.