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[backport] Fix pdf-standard with KOMA classes under KOMA-Script 3.49.3 - #15158
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KOMA-Script 3.49.3 turned the 3.49.2 warning about \DocumentMetadata into a fatal error for every KOMA class (scrartcl, scrreprt, scrbook) that has no tagging support file. Quarto emits \DocumentMetadata whenever pdf-standard is set and defaults to scrartcl, so every pdf-standard PDF render fails once TeX Live ships the new KOMA-Script. KOMA documents \komascript_documentmetadata_test: as the hook packages and wrapper classes define before loading the class to replace this check. Defining it as a no-op right after \DocumentMetadata restores the 3.49.2 behaviour, i.e. what 1.9 and 1.10 produced, with no change in class or layout. The cs_if_exist guard keeps an existing definition. Non-KOMA classes never read the macro. Known tradeoff: this bypasses a deliberate KOMA check, and KOMA classes still do not tag sectioning commands (#14422); that is addressed separately. KOMA calls the hook provisional, so a later release may need a different approach. Fixes #15143 (cherry picked from commit 03c9314)
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Backport from #15154
Backport of the fix for #15143: KOMA-Script 3.49.3 aborts every KOMA class (
scrartcl,scrreprt,scrbook) with\DocumentMetadata not supported!whenpdf-standardis set, so a TeX Live update breaks allpdf-standardPDF renders. The template now defines the no-op\komascript_documentmetadata_test:hook KOMA documents for this case, which restores the pre-3.49.3 output.Checklist
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