tdf#92061 RTF import: fix missing body text after footnote

A missing seek in the \footnote handler could result in a situation that
the missed text contained a "{" but not its matching "}", which resulted
in the parser terminating earlier than the end of the document.

Change-Id: I6df476b2d6397dfa918111b33854dc2f95fbe81d

sw/qa/extras/rtfimport/data/tdf92061.rtf

+{\rtf1
+body-before
+{\footnote AAAAA {B} C}
+body-after\par
+}

sw/qa/extras/rtfimport/rtfimport.cxx

@@ -2307,6 +2307,12 @@ DECLARE_RTFIMPORT_TEST(testBinSkipping, "bin-skipping.rtf")
     CPPUNIT_ASSERT_EQUAL(OUString("text"), getRun(getParagraph(1), 1)->getString());
 }
 
+DECLARE_RTFIMPORT_TEST(testTdf92061, "tdf92061.rtf")
+{
+    // This was "C", i.e. part of the footnote ended up in the body text.
+    CPPUNIT_ASSERT_EQUAL(OUString("body-after"), getRun(getParagraph(1), 3)->getString());
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

writerfilter/source/rtftok/rtfdocumentimpl.cxx

@@ -1682,11 +1682,13 @@ RTFError RTFDocumentImpl::dispatchDestination(RTFKeyword nKeyword)
                 // Check if this is an endnote.
                 OStringBuffer aBuf;
                 char ch;
+                sal_Size nCurrent = Strm().Tell();
                 for (int i = 0; i < 7; ++i)
                 {
                     Strm().ReadChar(ch);
                     aBuf.append(ch);
                 }
+                Strm().Seek(nCurrent);
                 OString aKeyword = aBuf.makeStringAndClear();
                 if (aKeyword.equals("\\ftnalt"))
                     nId = NS_ooxml::LN_endnote;