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Backport !2887 “glocalfileinfo: Ensure we always sniff some data to get the content type” to glib-2-74

Merged Philip Withnall requested to merge pwithnall/glib:backport-2887-content-type-sniffing-glib-2-74 into glib-2-74

In case the XDG database is not initialized yet we may try to sniff a 0-length data, making our content-type routines to mark non-empty files as application/x-zerosize.

This is wrong, so in case the sniff size is not set, let's just try to read the default value. To avoid false-application/x-zerosize results (that are not something we want as per legacy assumptions).

See: https://bugzilla.gnome.org/show_bug.cgi?id=755795

Fixes: #2742 (closed)

Trivial backport of !2887 (merged) to glib-2-74.