ppd-cache.c: Use 0.5mm for delta when comparing sizes #46
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@szlt5 found out libppd does not use the same delta as CUPS, which causes filters to use first size from the array, because the similar size according PWG (which recommends max delta 0.5mm) is not matched as useable.
Related to #29, but not fixing the original issue.
@szlt5 thank you for finding it!