fdo#82165: ODF import: clear all shapes when removing header content

Shapes anchored to the first or last paragraph survive setString("")
so need to be deleted with some ruse.

(regression from b8499fc3)

Change-Id: I00a8132583c45d1953c207932cc7f02f3065ae77
(cherry picked from commit 555c988f)
Reviewed-on: https://gerrit.libreoffice.org/10895Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

sw/qa/extras/odfimport/odfimport.cxx

@@ -344,6 +344,16 @@ DECLARE_ODFIMPORT_TEST(testFdo68839, "fdo68839.odt")
             getProperty<OUString>(xFrame2, "ChainNextName"));
 }
 
+DECLARE_ODFIMPORT_TEST(testFdo82165, "fdo82165.odt")
+{
+    // there was a duplicate shape in the left header
+    lcl_CheckShape(getShape(1), "Picture 9");
+    try {
+        uno::Reference<drawing::XShape> xShape = getShape(2);
+        CPPUNIT_FAIL("IndexOutOfBoundsException expected");
+    } catch (lang::IndexOutOfBoundsException const&) { }
+}
+
 DECLARE_ODFIMPORT_TEST(testFdo37606, "fdo37606.odt")
 {
     SwXTextDocument* pTxtDoc = dynamic_cast<SwXTextDocument *>(mxComponent.get());

xmloff/source/text/XMLTextHeaderFooterContext.cxx

@@ -18,6 +18,7 @@
  */
 
 #include <com/sun/star/text/XText.hpp>
+#include <com/sun/star/text/XParagraphAppend.hpp>
 #include <com/sun/star/text/XRelativeTextContentRemove.hpp>
 #include <xmloff/nmspmap.hxx>
 #include <xmloff/xmlnmspe.hxx>
@@ -158,8 +159,16 @@ SvXMLImportContext *XMLTextHeaderFooterContext::CreateChildContext(
 
             if( bRemoveContent )
             {
-                OUString aText;
-                xText->setString( aText );
+                xText->setString(OUString());
+                // fdo#82165 shapes anchored at the beginning or end survive
+                // setString("") - kill them the hard way: SwDoc::DelFullPara()
+                uno::Reference<text::XParagraphAppend> const xAppend(
+                        xText, uno::UNO_QUERY_THROW);
+                uno::Reference<lang::XComponent> const xPara(
+                    xAppend->finishParagraph(
+                        uno::Sequence<beans::PropertyValue>()),
+                    uno::UNO_QUERY_THROW);
+                xPara->dispose();
             }
 
             UniReference < XMLTextImportHelper > xTxtImport =