Collapse split page content into single stream#640
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Fix layout shifts when a page's /Contents is a split-stream array (e.g. after redaction). Previously only dirty streams were rewritten, preserving original split boundaries and breaking graphics-state handoff between streams; this could shift visible layout. CPDF_PageContentGenerator::GenerateContent now collapses all active page objects into a single canonical content stream via GenerateCanonicalPageStream and CPDF_PageContentManager::ReplaceWithSingleStream. Form XObjects keep their existing single-stream behavior. Also adds the changeset note and updates the pdfium-src submodule and bundled pdfium.wasm.
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Fix layout shifts when a page's /Contents is a split-stream array (e.g. after redaction). Previously only dirty streams were rewritten, preserving original split boundaries and breaking graphics-state handoff between streams; this could shift visible layout. CPDF_PageContentGenerator::GenerateContent now collapses all active page objects into a single canonical content stream via GenerateCanonicalPageStream and CPDF_PageContentManager::ReplaceWithSingleStream. Form XObjects keep their existing single-stream behavior. Also adds the changeset note and updates the pdfium-src submodule and bundled pdfium.wasm.