[Fix 2.5] recover drawing area (drastic version) #18085
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What does this PR do?
Removes a clippath that is making a problem on the recently updated Chromium-based browsers. Different from #18084, this PR completely removes two clippath:url#viewbox that seem not necessary anymore.
Closes Issue(s)
Closes #18066
Related discussion: https://groups.google.com/g/bigbluebutton-dev/c/r35CE7Z1zfU
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Compared to #18084, this PR may improve the performance because clippath needs quite a bit of PC resource. So far I don't find any problem with this PR, but I cannot test everything, needless to say.
I guess this clippath was indispensable in the early times to mask the drawing at outside of the viewbox, but during the development BBB has become more robust and able to eliminate the possibility of such outsiders by other means.