see http://repocop.altlinux.org/pub/repocop/reports/html/by-srpm/mediawiki-extensions-PdfHandler-1.23-alt1.src.html mediawiki-extensions-PdfHandler is included in latest mediawiki. Please, add Conflicts/Obsoletes and drop mediawiki-extensions-PdfHandler. P.S. also there are file conflicts in http://repocop.altlinux.org/pub/repocop/reports/html/by-srpm/mediawiki-extensions-Math-1.24-alt1.src.html
mediawiki-1.29.2-alt2 -> sisyphus: Thu Mar 29 2018 Igor Vlasenko <viy@altlinux.ru> 1.29.2-alt2 - NMU: added conflict with mediawiki-extensions-PdfHandler (included in 1.29) (closes: #34708)