[5.4] Proper float comparison in ratio validation #17963
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Spotted this while reading #17943.
One does not simply directly compare floats for equality.
There are countless articles about this, and a big warning here.
5-digit precision is needed to detect a 1px mismatch in a 122880x69120 128K image.
I chose 6-digit precision, it costs nothing more and it adds a safety margin.
Maybe this change would have to be backported as well.
ping @themsaid