Fix top margin in DOC import for tdf#117885

When calculating the height of the top/bottom margin, we take into
account whether the DOC section has a header/footer enabled.

If the DOC section contains only a first-page header/footer, and the
display of first-page header/footer in this section is not enabled,
then we must consider the section to have no header/footer.

(Also add a test case using the doc supplied by the reporter in
 tdf#117885)

Change-Id: I8040298a2953b3f3fe8dd80bfd62db2304db938e
Reviewed-on: https://gerrit.libreoffice.org/55135Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

sw/qa/extras/ww8export/ww8export2.cxx

@@ -821,6 +821,25 @@ DECLARE_WW8EXPORT_TEST(testTdf117503, "tdf117503.docx")
     CPPUNIT_ASSERT_EQUAL(2, getPages());
 }
 
+DECLARE_WW8EXPORT_TEST(testTdf117885, "tdf117885.doc")
+{
+    xmlDocPtr pXmlDoc = parseLayoutDump();
+
+    /* Get the vertical position of the paragraph containing the text "Start" */
+    sal_Int32 nParaA_Top = getXPath(pXmlDoc,
+        "/root/page/body/column[1]/body/txt[text()='Start']/infos/bounds", "top"
+        ).toInt32();
+
+    /* Get the vertical position of the paragraph containing the text "Top B" */
+    sal_Int32 nParaB_Top = getXPath(pXmlDoc,
+        "/root/page/body/column[2]/body/txt[text()='Top B']/infos/bounds", "top"
+        ).toInt32();
+
+    /* These two paragraphs are supposed to be at the top of the left
+     * and right columns respectively.  Check that they actually line up: */
+    CPPUNIT_ASSERT_EQUAL(nParaA_Top, nParaB_Top);
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

sw/source/filter/ww8/ww8par6.cxx

@@ -496,8 +496,17 @@ void wwSectionManager::GetPageULData(const wwSection &rSection,
         nWWUp += rSection.maSep.dzaGutter;
     }
 
-    rData.bHasHeader = (rSection.maSep.grpfIhdt &
-        (WW8_HEADER_EVEN | WW8_HEADER_ODD | WW8_HEADER_FIRST)) != 0;
+    /* Check whether this section has headers / footers */
+    sal_uInt16 nHeaderMask = WW8_HEADER_EVEN | WW8_HEADER_ODD;
+    sal_uInt16 nFooterMask = WW8_HEADER_EVEN | WW8_HEADER_ODD;
+    /* Ignore the presence of a first-page header/footer unless it is enabled */
+    if( rSection.HasTitlePage() )
+    {
+        nHeaderMask |= WW8_HEADER_FIRST;
+        nFooterMask |= WW8_FOOTER_FIRST;
+    }
+    rData.bHasHeader = (rSection.maSep.grpfIhdt & nHeaderMask) != 0;
+    rData.bHasFooter = (rSection.maSep.grpfIhdt & nFooterMask) != 0;
 
     if( rData.bHasHeader )
     {
@@ -518,9 +527,6 @@ void wwSectionManager::GetPageULData(const wwSection &rSection,
     else // no header -> just use Up as-is
         rData.nSwUp = std::abs(nWWUp);
 
-    rData.bHasFooter = (rSection.maSep.grpfIhdt &
-        (WW8_FOOTER_EVEN | WW8_FOOTER_ODD | WW8_FOOTER_FIRST)) != 0;
-
     if( rData.bHasFooter )
     {
         rData.nSwLo = nWWFBot;              // footer -> convert