If font is file-like object, do not re-read from object to get variant #6234
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Resolves #6209
In the issue, a user opens a font from a file-like object, and the font contents are read from that object.
Then the user tries to open a
font_variant()and the font contents are read from the same object again, without seeking, which means that there is nothing left to read.This PR changes
font_variant()to just use the originally read bytes in that situation.