Call to cupsGetDestMediaDefault always returns Letter

[Jim Orcheson]

The following always returns size of Letter regardless of what the default is set to at localhost:631. This is the case for multiple printers and printer manufacturers.

cups_size_t size;
int count = cupsGetDestMediaDefault(CUPS_HTTP_DEFAULT, m_dest, m_info, 0, &size);

Ubuntu 20.04
CUPS 2.3.1-9ubuntu1.1
gcc 9.3.0

For driverless printers, the PPD file shows the correct default.