fdo#81102: fix .doc import of blank even page header

Honour the "different odd & even pages" header/footer setting from the
doc file even if there is no content for an even page header or footer.

Conflicts:
	sw/qa/extras/ww8import/ww8import.cxx
Reviewed on:
	https://gerrit.libreoffice.org/10191

Change-Id: I963f7f7189e399b1d859db0788fbfd291e868c54

sw/qa/extras/ww8import/ww8import.cxx

@@ -469,6 +469,22 @@ DECLARE_WW8IMPORT_TEST(testFdp80333, "fdo80333.doc")
     CPPUNIT_ASSERT_EQUAL(table::ShadowLocation_NONE, aShadow.Location);
 }
 
+DECLARE_WW8IMPORT_TEST(testFdo81102, "fdo81102.doc")
+{
+    // get page style at beginning of document
+    uno::Reference<text::XTextDocument> textDocument(
+        mxComponent, uno::UNO_QUERY);
+    uno::Reference<text::XTextRange> start(
+        textDocument->getText()->getStart(), uno::UNO_QUERY);
+    OUString pageStyleName = getProperty<OUString>(start, "PageStyleName");
+    uno::Reference<style::XStyle> pageStyle(
+        getStyles("PageStyles")->getByName(pageStyleName), uno::UNO_QUERY);
+
+    // check that left and right pages do not share the same header
+    bool headerIsShared = getProperty<bool>(pageStyle, "HeaderIsShared");
+    CPPUNIT_ASSERT(!headerIsShared);
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

sw/source/filter/ww8/ww8par.cxx

@@ -4318,15 +4318,12 @@ void wwSectionManager::SetSegmentToPageDesc(const wwSection &rSection,
 
 void wwSectionManager::SetUseOn(wwSection &rSection)
 {
-    bool bEven = (rSection.maSep.grpfIhdt & (WW8_HEADER_EVEN|WW8_FOOTER_EVEN)) ?
-        true : false;
-
     bool bMirror = mrReader.pWDop->fMirrorMargins ||
         mrReader.pWDop->doptypography.f2on1;
 
     UseOnPage eUseBase = bMirror ? nsUseOnPage::PD_MIRROR : nsUseOnPage::PD_ALL;
     UseOnPage eUse = eUseBase;
-    if (!bEven)
+    if (!mrReader.pWDop->fFacingPages)
         eUse = (UseOnPage)(eUse | nsUseOnPage::PD_HEADERSHARE | nsUseOnPage::PD_FOOTERSHARE);
     if (!rSection.HasTitlePage())
         eUse = (UseOnPage)(eUse | nsUseOnPage::PD_FIRSTSHARE);