M10: Two-sided starts at Printer default, so the printer's own duplex applies (#2422)

The Print dialog always sent its Two-sided choice, Off unless changed, so a
two-sided default set in the printer's Properties never applied. Acrobat has no
default of its own here and follows the printer's. Two-sided now starts at
Printer default, which sends no duplex setting (craft-print's Job::duplex =
None). Off and the two edges still override it. Cut and stack still sends Off,
since it needs single-sided sheets.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

parity/acrobat-features.toml

@@ -8020,8 +8020,8 @@ milestone = "M10"
 status = "shipped"
 commands = ["print.dialog"]
 tools = ["doc_print"]
-evidence = ["crates/print/src/tests.rs::spooler_arguments_and_printer_list"]
-notes = "long/short edge via the spooler: lp -o sides=…, and the Windows driver's Duplex setting"
+evidence = ["crates/print/src/tests.rs::spooler_arguments_and_printer_list", "crates/ui-egui/src/print_ui.rs::two_sided_follows_the_printer_until_chosen"]
+notes = "long/short edge via the spooler: lp -o sides=…, and the Windows driver's Duplex setting. Two-sided starts at Printer default, as in Acrobat: nothing is sent, so the printer's own default (its Properties) applies until Off or an edge is chosen. Missing: the document's /ViewerPreferences /Duplex preset isn't read yet"
 
 [[feature]]
 id = "print.n-up"