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Federico Mena Quintero authored
We now have a LengthUnit enum for use with RsvgLength, instead of representing units with simple chars. Along with this change, the filters code was hackily sticking an 'n' into some_length.factor to really mean, 'this length didn't get specified in the SVG data'. Replaced that with boolean foo_specified fields that the code later checks to see if the length in question is available. The same pattern was used in the Text code; also made it use foo_specified booleans.
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