RTF import: fix import of \line symbol

"Required line break" was eaten by the newly added code in text() to
ignore \'0a.  (regression from f593a2e417)

Change-Id: Id32687c40a17ddb99196635cedfc850182705799

sw/qa/extras/rtfimport/data/fdo58646line.rtf

@@ -0,0 +1 @@
+{\rtf1 foo\line bar}

sw/qa/extras/rtfimport/rtfimport.cxx

@@ -138,6 +138,7 @@ public:
     void testFdo58933();
     void testFdo44053();
     void testFdo48440();
+    void testFdo58646line();
     void testFdo58646();
     void testFdo59419();
     void testFdo58076_2();
@@ -250,6 +251,7 @@ void Test::run()
         {"fdo58933.rtf", &Test::testFdo58933},
         {"fdo44053.rtf", &Test::testFdo44053},
         {"fdo48440.rtf", &Test::testFdo48440},
+        {"fdo58646line.rtf", &Test::testFdo58646line},
         {"fdo58646.rtf", &Test::testFdo58646},
         {"fdo59419.rtf", &Test::testFdo59419},
         {"fdo58076-2.rtf", &Test::testFdo58076_2},
@@ -1076,6 +1078,12 @@ void Test::testFdo48440()
     CPPUNIT_ASSERT_EQUAL(2, getPages());
 }
 
+void Test::testFdo58646line()
+{
+    // \line symbol was ignored
+    getParagraph(1, "foo\nbar");
+}
+
 void Test::testFdo58646()
 {
     // Page break was ignored inside a continous section, on title page.

writerfilter/source/rtftok/rtfdocumentimpl.cxx

@@ -1605,12 +1605,16 @@ int RTFDocumentImpl::dispatchSymbol(RTFKeyword nKeyword)
         checkUnicode();
     setNeedSect();
     RTFSkipDestination aSkip(*this);
-    sal_uInt8 cCh = 0;
 
+    if (RTF_LINE == nKeyword)
+    {   // very special handling since text() will eat lone '\n'
+        singleChar('\n');
+        return 0;
+    }
     // Trivial symbols
+    sal_uInt8 cCh = 0;
     switch (nKeyword)
     {
-        case RTF_LINE: cCh = '\n'; break;
         case RTF_TAB: cCh = '\t'; break;
         case RTF_BACKSLASH: cCh = '\\'; break;
         case RTF_LBRACE: cCh = '{'; break;