tdf#152231 vcl: PDF/UA export: content of comments in the margin

... is also Artifact.

The problem is that ImpEditEngine::Paint() always produces tags,
it can't easily check if it's inside a layout environment that is an
Artifact.

But it looks like PDFWriterImpl::beginStructureElement() already wants
to handle and suppress a structure element inside a NonStruct, except
that it calls endStructureElementMCSeq() before checkEmitStructure(),
so no structure marked content sequence is produced, but the content is
outside the Artifact marked content sequence, and possibly a second
Artifact marked content sequence will be opened once the structure
element is finished.

(btw, it's allowed to nest marked content sequences in PDF, but
nesting a structure element inside an Artifact appears dubious)

Change-Id: Ib3eef9c611e28242854c712ce974fd8cfecd8ac2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/153810
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

2 files changed, 318 insertions, 0 deletions

diff --git a/vcl/qa/cppunit/pdfexport/data/tdf152231.fodt b/vcl/qa/cppunit/pdfexport/data/tdf152231.fodt
new file mode 100644
index 000000000000..26b5d329b2aa
--- /dev/null
+++ b/vcl/qa/cppunit/pdfexport/data/tdf152231.fodt
@@ -0,0 +1,208 @@
+<?xml version='1.0' encoding='UTF-8'?>
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+ <office:meta><meta:initial-creator>Gabor Kelemen LO</meta:initial-creator><meta:creation-date>2022-11-22T00:38:49.808000000</meta:creation-date><dc:date>2022-11-22T01:02:17.524000000</dc:date><dc:creator>Gabor Kelemen LO</dc:creator><meta:editing-duration>PT23M25S</meta:editing-duration><meta:editing-cycles>11</meta:editing-cycles><meta:generator>LibreOfficeDev/24.2.0.0.alpha0$Linux_X86_64 LibreOffice_project/3d1f9c90605623e5c7e7dd2d28f87aaa45fb9c86</meta:generator><dc:title>aaa</dc:title><meta:document-statistic meta:table-count="0" meta:image-count="0" meta:object-count="0" meta:page-count="1" meta:paragraph-count="12" meta:word-count="291" meta:character-count="1539" meta:non-whitespace-character-count="1250"/><meta:print-date>2023-06-30T17:07:42.601941685</meta:print-date><meta:printed-by>PDF files</meta:printed-by></office:meta>
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+  <style:font-face style:name="NSimSun1" svg:font-family="NSimSun" style:font-family-generic="system" style:font-pitch="variable"/>
+  </office:font-face-decls>
+ <office:styles>
+  <style:default-style style:family="graphic">
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+   <style:paragraph-properties style:text-autospace="ideograph-alpha" style:line-break="strict" loext:tab-stop-distance="0cm" style:font-independent-line-spacing="false">
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+  <style:default-style style:family="paragraph">
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+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
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+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
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+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
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+   </text:outline-level-style>
+   <text:outline-level-style text:level="8" loext:num-list-format="%8%" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
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+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
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+   <style:header-style/>
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+    <style:footnote-sep style:width="0.018cm" style:distance-before-sep="0.101cm" style:distance-after-sep="0.101cm" style:line-style="solid" style:adjustment="left" style:rel-width="25%" style:color="#000000"/>
+   </style:page-layout-properties>
+   <style:header-style/>
+   <style:footer-style/>
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+  <style:page-layout style:name="pm7">
+   <style:page-layout-properties fo:page-width="21.001cm" fo:page-height="29.7cm" style:num-format="1" style:print-orientation="portrait" fo:margin-top="2cm" fo:margin-bottom="2cm" fo:margin-left="2cm" fo:margin-right="2cm" style:writing-mode="lr-tb" style:footnote-max-height="0cm" loext:margin-gutter="0cm">
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+   <style:header-style/>
+   <style:footer-style/>
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+  <style:page-layout style:name="pm8">
+   <style:page-layout-properties fo:page-width="29.7cm" fo:page-height="21.001cm" style:num-format="1" style:print-orientation="landscape" fo:margin-top="2cm" fo:margin-bottom="2cm" fo:margin-left="2cm" fo:margin-right="2cm" style:writing-mode="lr-tb" style:footnote-max-height="0cm" loext:margin-gutter="0cm">
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+   </style:page-layout-properties>
+   <style:header-style/>
+   <style:footer-style/>
+  </style:page-layout>
+  <style:style style:name="dp1" style:family="drawing-page">
+   <style:drawing-page-properties draw:background-size="full"/>
+  </style:style>
+ </office:automatic-styles>
+ <office:master-styles>
+  <style:master-page style:name="Standard" style:page-layout-name="pm1" draw:style-name="dp1"/>
+  </office:master-styles>
+ <office:body>
+  <office:text>
+   <text:sequence-decls>
+    <text:sequence-decl text:display-outline-level="0" text:name="Illustration"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Table"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Text"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Drawing"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Figure"/>
+   </text:sequence-decls>
+   <text:p text:style-name="Standard">He heard quiet steps behind him. </text:p>
+   <text:p text:style-name="Standard">That didn't bode well. </text:p>
+   <text:p text:style-name="Standard">Who could be following him this late at night and in this deadbeat part of town?</text:p>
+   <text:p text:style-name="Standard"><text:span text:style-name="T1">A</text:span>nd at this particular moment, just after he pulled off the big time and was making off with the greenbacks. </text:p>
+   <text:p text:style-name="Standard">Was there another crook who'd had the same idea, and was now watching him and waiting for a chance to grab the fruit of his labor? </text:p>
+   <text:p text:style-name="Standard">Or did the steps behind him mean that one of many law officers in town was on to him and just waiting to pounce and snap those cuffs on his wrists? </text:p>
+   <text:p text:style-name="Standard"><office:annotation office:name="__Annotation__234_1396804301" loext:resolved="false">
+     <dc:creator>Gabor Kelemen LO</dc:creator>
+     <dc:date>2022-11-22T00:56:44.315000000</dc:date>
+     <meta:creator-initials>GK</meta:creator-initials>
+     <text:p text:style-name="P2"><text:span text:style-name="T2">This is a comment</text:span></text:p>
+    </office:annotation>He nervously looked all around.<office:annotation-end office:name="__Annotation__234_1396804301"/> </text:p>
+   <text:p text:style-name="Standard">Suddenly he saw the alley. </text:p>
+   <text:p text:style-name="Standard">Like lightning he darted off to the left and disappeared between the two warehouses almost falling </text:p>
+   <text:p text:style-name="Standard">over the trash can lying in the middle of the sidewalk. </text:p>
+   <text:p text:style-name="Standard">He tried to nervously tap his way along in the inky </text:p>
+   <text:p text:style-name="P1">darkness and suddenly stiffened: it was a dead-end, he would have to go back the way he had come. The steps got louder and louder, he saw the black outline of a figure coming around the corner. Is this the end of the line? he thought pressing himself back against the wall trying to make himself invisible in the dark, was all that planning and energy wasted? He was dripping with sweat now, cold and wet, he could smell the fear coming off his clothes. Suddenly next to him, with a barely noticeable squeak, a door swung quietly to and fro in the night's breeze. Could this be the haven he'd prayed for? Slowly he slid toward the door, pressing himself more and more into the wall, into the dark, away from his enemy. Would this door save his hide?</text:p>
+  </office:text>
+ </office:body>
+</office:document>
\ No newline at end of file
diff --git a/vcl/qa/cppunit/pdfexport/pdfexport.cxx b/vcl/qa/cppunit/pdfexport/pdfexport.cxx
index e19f989ce9b9..120185eb6d14 100644
--- a/vcl/qa/cppunit/pdfexport/pdfexport.cxx
+++ b/vcl/qa/cppunit/pdfexport/pdfexport.cxx
@@ -3204,6 +3204,116 @@ CPPUNIT_TEST_FIXTURE(PdfExportTest, testTdf139736)
     CPPUNIT_ASSERT(nArtifacts >= 3);
 }
 
+CPPUNIT_TEST_FIXTURE(PdfExportTest, testTdf152231)
+{
+    aMediaDescriptor["FilterName"] <<= OUString("writer_pdf_Export");
+
+    // Enable PDF/UA
+    uno::Sequence<beans::PropertyValue> aFilterData(
+        comphelper::InitPropertySequence({ { "PDFUACompliance", uno::Any(true) },
+                                           { "ExportNotesInMargin", uno::Any(true) },
+                                           { "SelectPdfVersion", uno::Any(sal_Int32(17)) } }));
+    aMediaDescriptor["FilterData"] <<= aFilterData;
+    saveAsPDF(u"tdf152231.fodt");
+
+    vcl::filter::PDFDocument aDocument;
+    SvFileStream aStream(maTempFile.GetURL(), StreamMode::READ);
+    CPPUNIT_ASSERT(aDocument.Read(aStream));
+
+    std::vector<vcl::filter::PDFObjectElement*> aPages = aDocument.GetPages();
+    CPPUNIT_ASSERT_EQUAL(static_cast<size_t>(1), aPages.size());
+
+    vcl::filter::PDFObjectElement* pContents = aPages[0]->LookupObject("Contents");
+    CPPUNIT_ASSERT(pContents);
+    vcl::filter::PDFStreamElement* pStream = pContents->GetStream();
+    CPPUNIT_ASSERT(pStream);
+    SvMemoryStream& rObjectStream = pStream->GetMemory();
+    // Uncompress it.
+    SvMemoryStream aUncompressed;
+    ZCodec aZCodec;
+    aZCodec.BeginCompression();
+    rObjectStream.Seek(0);
+    aZCodec.Decompress(rObjectStream, aUncompressed);
+    CPPUNIT_ASSERT(aZCodec.EndCompression());
+
+    auto pStart = static_cast<const char*>(aUncompressed.GetData());
+    const char* const pEnd = pStart + aUncompressed.GetSize();
+
+    enum
+    {
+        Default,
+        Artifact,
+        Tagged
+    } state
+        = Default;
+
+    auto nLine(0);
+    auto nTagged(0);
+    auto nArtifacts(0);
+    while (true)
+    {
+        ++nLine;
+        auto const pLine = ::std::find(pStart, pEnd, '\n');
+        if (pLine == pEnd)
+        {
+            break;
+        }
+        std::string_view const line(pStart, pLine - pStart);
+        pStart = pLine + 1;
+        if (!line.empty() && line[0] != '%')
+        {
+            ::std::cerr << nLine << ": " << line << "\n";
+            if (line == "/Artifact BMC")
+            {
+                CPPUNIT_ASSERT_EQUAL_MESSAGE("unexpected nesting", Default, state);
+                state = Artifact;
+                ++nArtifacts;
+            }
+            else if (o3tl::starts_with(line, "/Standard<</MCID "))
+            {
+                CPPUNIT_ASSERT_EQUAL_MESSAGE("unexpected nesting", Default, state);
+                state = Tagged;
+                ++nTagged;
+            }
+            else if (line == "EMC")
+            {
+                CPPUNIT_ASSERT_MESSAGE("unexpected end", state != Default);
+                state = Default;
+            }
+            else if (nLine > 1) // first line is expected "0.1 w"
+            {
+                CPPUNIT_ASSERT_MESSAGE("unexpected content outside MCS", state != Default);
+            }
+        }
+    }
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("unclosed MCS", Default, state);
+    CPPUNIT_ASSERT(nTagged >= 12); // text in body
+    // 1 annotation
+    CPPUNIT_ASSERT(nArtifacts >= 1);
+
+    auto nPara(0);
+    for (const auto& rDocElement : aDocument.GetElements())
+    {
+        auto pObject = dynamic_cast<vcl::filter::PDFObjectElement*>(rDocElement.get());
+        if (!pObject)
+            continue;
+        auto pType = dynamic_cast<vcl::filter::PDFNameElement*>(pObject->Lookup("Type"));
+        if (pType && pType->GetValue() == "StructElem")
+        {
+            auto pS = dynamic_cast<vcl::filter::PDFNameElement*>(pObject->Lookup("S"));
+            if (pS && pS->GetValue() == "Standard")
+            {
+                ++nPara;
+                auto pKids = dynamic_cast<vcl::filter::PDFArrayElement*>(pObject->Lookup("K"));
+                CPPUNIT_ASSERT(pKids);
+                // one problem was that that some StructElem were missing kids
+                CPPUNIT_ASSERT(!pKids->GetElements().empty());
+            }
+        }
+    }
+    CPPUNIT_ASSERT_EQUAL(static_cast<decltype(nPara)>(12), nPara);
+}
+
 CPPUNIT_TEST_FIXTURE(PdfExportTest, testTdf149140)
 {
     aMediaDescriptor["FilterName"] <<= OUString("writer_pdf_Export");