tdf#140572 docx export: avoid DocDefault superscript crash

This fixes a crash situation introduced in LO 6.4
by commit d71cf6390a89ea6a4fab724e3a7996f28ca33661.

The crash was occurring when the DocDefaults were
being exported. Since there was no character or
paragraph context, the lookup of the related
fontsize was crashing.

Moving this variable closer to where it is used
"just happens" to fix the crash. Because the
DocDefault is considered a style, we are just
exporting the superscript/subscript as a default
size, and so don't need to know the font size.
Thus a style-context position can't cause the
crash again.

So it isn't a great fix, and leaves the possibility
for the same thing to happen in other situations
(like RES_CHRATR_BACKGROUND), but at least it
quickly solves this known problem, and is easily
backportable, as well as following best practice
of keeping variables as close to where they are
used as possible - eliminating some unnecessary
lookups.

I did look for a more generic fix (or whether
other properties could be affected) and didn't
come with any clear examples or a better fix.

Change-Id: I03dc3d74a5148973c065cadb09c5c79068f12df1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111403
Tested-by: Jenkins
Tested-by: Justin Luth <justin_luth@sil.org>
Reviewed-by: Justin Luth <justin_luth@sil.org>
(cherry picked from commit 76d2a9fd461dde817fbb1c5d4aa830cb2c42b504)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111458
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
(cherry picked from commit 2f26a9c9242b8443f0fb987822404027053a98ff)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111461
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Tested-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

3 files changed, 6 insertions, 1 deletions

diff --git a/sw/qa/extras/ooxmlexport/data/tdf140572_docDefault_superscript.docx b/sw/qa/extras/ooxmlexport/data/tdf140572_docDefault_superscript.docx
new file mode 100755
index 000000000000..fd176dc8c896
--- /dev/null
+++ b/sw/qa/extras/ooxmlexport/data/tdf140572_docDefault_superscript.docx
diff --git a/sw/qa/extras/ooxmlexport/ooxmlexport16.cxx b/sw/qa/extras/ooxmlexport/ooxmlexport16.cxx
index c2d17d965781..c300f7068110 100644
--- a/sw/qa/extras/ooxmlexport/ooxmlexport16.cxx
+++ b/sw/qa/extras/ooxmlexport/ooxmlexport16.cxx
@@ -48,6 +48,11 @@ DECLARE_OOXMLEXPORT_EXPORTONLY_TEST(testFooterMarginLost, "footer-margin-lost.do
     assertXPath(pXmlDoc, "/w:document/w:body/w:sectPr/w:pgMar", "footer", "709");
 }
 
+DECLARE_OOXMLEXPORT_EXPORTONLY_TEST(testTdf140572_docDefault_superscript, "tdf140572_docDefault_superscript.docx")
+{
+    // A round-trip was crashing.
+}
+
 DECLARE_OOXMLEXPORT_TEST(testTdf138953, "croppedAndRotated.odt")
 {
     CPPUNIT_ASSERT_EQUAL(1, getShapes());
diff --git a/sw/source/filter/ww8/docxattributeoutput.cxx b/sw/source/filter/ww8/docxattributeoutput.cxx
index 4f8773bef97b..018a00c27392 100644
--- a/sw/source/filter/ww8/docxattributeoutput.cxx
+++ b/sw/source/filter/ww8/docxattributeoutput.cxx
@@ -7253,9 +7253,9 @@ void DocxAttributeOutput::CharEscapement( const SvxEscapementItem& rEscapement )
     if ( !sIss.isEmpty() )
         m_pSerializer->singleElementNS(XML_w, XML_vertAlign, FSNS(XML_w, XML_val), sIss);
 
-    const SvxFontHeightItem& rItem = m_rExport.GetItem(RES_CHRATR_FONTSIZE);
     if (sIss.isEmpty() || sIss.match("baseline"))
     {
+        const SvxFontHeightItem& rItem = m_rExport.GetItem(RES_CHRATR_FONTSIZE);
         float fHeight = rItem.GetHeight();
         OString sPos = OString::number( round(( fHeight * nEsc ) / 1000) );
         m_pSerializer->singleElementNS(XML_w, XML_position, FSNS(XML_w, XML_val), sPos);