Handle font size 0 in AnnotAppearanceBuilder::drawSignatureFieldText
0 means 'choose the size according to available space', like we do elsewhere
See https://invent.kde.org/graphics/okular/-/merge_requests/1053
Edited by Nicolas Fella
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0 means 'choose the size according to available space', like we do elsewhere
See https://invent.kde.org/graphics/okular/-/merge_requests/1053