tdf#135942: avoid collecting autostyles during writing them

This modifies the container over which iteration is performed.
Additionally, make sure that all nested table autostyles are
collected on the first phase.

Change-Id: I74c0bb1aaacad095226c21e6bf51cc8668133bb3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/101096
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
(cherry picked from commit f0286ad82465152b29bba01ab2edeb97291397fa)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/101069
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit 0273675e7dde577077ccca17571846a0942f2630)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/102311
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>

5 files changed, 36 insertions, 1 deletions

diff --git a/include/xmloff/txtparae.hxx b/include/xmloff/txtparae.hxx
index 7ded21114fd6..c01c03eea4d3 100644
--- a/include/xmloff/txtparae.hxx
+++ b/include/xmloff/txtparae.hxx
@@ -365,6 +365,8 @@ protected:
         const css::uno::Reference< css::beans::XPropertySet> & i_xPortion,
         bool i_bAutoStyles, bool i_isProgress, bool & rPrevCharIsSpace);
 
+    bool isAutoStylesCollected() const { return mbCollected; }
+
     virtual void exportTableAutoStyles();
 
 public:
diff --git a/sw/qa/extras/odfexport/data/nestedTableInFooter.odt b/sw/qa/extras/odfexport/data/nestedTableInFooter.odt
new file mode 100644
index 000000000000..0356f04ee14e
--- /dev/null
+++ b/sw/qa/extras/odfexport/data/nestedTableInFooter.odt
diff --git a/sw/qa/extras/odfexport/odfexport.cxx b/sw/qa/extras/odfexport/odfexport.cxx
index bfc17ca284f3..321ce301fb9c 100644
--- a/sw/qa/extras/odfexport/odfexport.cxx
+++ b/sw/qa/extras/odfexport/odfexport.cxx
@@ -2355,5 +2355,17 @@ DECLARE_ODFEXPORT_TEST(tdf124470, "tdf124470TableAndEmbeddedUsedFonts.odt")
     }
 }
 
+DECLARE_ODFEXPORT_TEST(tdf135942, "nestedTableInFooter.odt")
+{
+    // All table autostyles should be collected, including nested, and must not crash.
+
+    CPPUNIT_ASSERT_EQUAL(1, getPages());
+
+    if (xmlDocPtr pXmlDoc = parseExport("styles.xml"))
+    {
+        assertXPath(pXmlDoc, "/office:document-styles/office:automatic-styles/style:style[@style:family='table']", 2);
+    }
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sw/source/filter/xml/xmltble.cxx b/sw/source/filter/xml/xmltble.cxx
index 80d786d8d884..6a4fa1c9902b 100644
--- a/sw/source/filter/xml/xmltble.cxx
+++ b/sw/source/filter/xml/xmltble.cxx
@@ -1183,8 +1183,27 @@ void SwXMLTextParagraphExport::exportTable(
                 // During the flat XML export (used e.g. by .sdw-export)
                 // ALL flags are set at the same time.
                 const bool bExportStyles = bool( GetExport().getExportFlags() & SvXMLExportFlags::STYLES );
-                if ( bExportStyles || !pFormat->GetDoc()->IsInHeaderFooter( aIdx ) )
+                if (!isAutoStylesCollected()
+                    && (bExportStyles || !pFormat->GetDoc()->IsInHeaderFooter(aIdx)))
+                {
                     maTableNodes.push_back(pTableNd);
+                    // Collect all tables inside cells of this table, too
+                    const auto aCellNames = pXTable->getCellNames();
+                    for (const OUString& rCellName : aCellNames)
+                    {
+                        css::uno::Reference<css::container::XEnumerationAccess> xCell(
+                            pXTable->getCellByName(rCellName), css::uno::UNO_QUERY);
+                        if (!xCell)
+                            continue;
+                        auto xEnumeration = xCell->createEnumeration();
+                        while (xEnumeration->hasMoreElements())
+                        {
+                            if (css::uno::Reference<css::text::XTextTable> xInnerTable{
+                                    xEnumeration->nextElement(), css::uno::UNO_QUERY })
+                                exportTable(xInnerTable, bAutoStyles, _bProgress);
+                        }
+                    }
+                }
             }
             else
             {
diff --git a/xmloff/source/text/txtparae.cxx b/xmloff/source/text/txtparae.cxx
index b830da30579b..24b5a8f2cbae 100644
--- a/xmloff/source/text/txtparae.cxx
+++ b/xmloff/source/text/txtparae.cxx
@@ -3675,6 +3675,8 @@ void XMLTextParagraphExport::exportTableAutoStyles() {}
 
 void XMLTextParagraphExport::exportTextAutoStyles()
 {
+    // tdf#135942: do not collect styles during their export: this may modify iterated containers
+    mbCollected = true;
     exportTableAutoStyles();
 
     GetAutoStylePool().exportXML( XML_STYLE_FAMILY_TEXT_PARAGRAPH );