RTF import: handle \snext

I.e. pressing enter at the end of a heading 1 paragraph should switch to
body text.

Change-Id: Idde9da3e2c058869a2ae4a9c61b3b43165121f5e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/124883
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

writerfilter/CppunitTest_writerfilter_rtftok.mk

@@ -16,6 +16,7 @@ $(eval $(call gb_CppunitTest_use_externals,writerfilter_rtftok,\
 ))
 
 $(eval $(call gb_CppunitTest_add_exception_objects,writerfilter_rtftok, \
+    writerfilter/qa/cppunittests/rtftok/rtfdispatchvalue \
     writerfilter/qa/cppunittests/rtftok/rtfdocumentimpl \
     writerfilter/qa/cppunittests/rtftok/rtfsdrimport \
     writerfilter/qa/cppunittests/rtftok/rtfsprm \

writerfilter/qa/cppunittests/rtftok/data/follow-style.rtf

@@ -0,0 +1,7 @@
+{\rtf1
+{\stylesheet
+{\s0\ql Normal;}
+{\s1\snext0 Heading 1;}
+}
+\pard\plain\s1 x\par
+}

writerfilter/qa/cppunittests/rtftok/rtfdispatchvalue.cxx

@@ -0,0 +1,77 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <test/bootstrapfixture.hxx>
+#include <unotest/macros_test.hxx>
+
+#include <com/sun/star/beans/XPropertySet.hpp>
+#include <com/sun/star/frame/Desktop.hpp>
+#include <com/sun/star/style/XStyleFamiliesSupplier.hpp>
+
+using namespace ::com::sun::star;
+
+namespace
+{
+/// Tests for writerfilter/source/rtftok/rtfdispatchvalue.cxx.
+class Test : public test::BootstrapFixture, public unotest::MacrosTest
+{
+private:
+    uno::Reference<lang::XComponent> mxComponent;
+
+public:
+    void setUp() override;
+    void tearDown() override;
+    uno::Reference<lang::XComponent>& getComponent() { return mxComponent; }
+};
+
+void Test::setUp()
+{
+    test::BootstrapFixture::setUp();
+
+    mxDesktop.set(frame::Desktop::create(mxComponentContext));
+}
+
+void Test::tearDown()
+{
+    if (mxComponent.is())
+        mxComponent->dispose();
+
+    test::BootstrapFixture::tearDown();
+}
+
+constexpr OUStringLiteral DATA_DIRECTORY = u"/writerfilter/qa/cppunittests/rtftok/data/";
+
+CPPUNIT_TEST_FIXTURE(Test, testFollowStyle)
+{
+    // Given a file with \snext:
+    OUString aURL = m_directories.getURLFromSrc(DATA_DIRECTORY) + "follow-style.rtf";
+
+    // When loading that file:
+    getComponent() = loadFromDesktop(aURL);
+
+    // Then make sure we set the follow of the para style correctly:
+    uno::Reference<style::XStyleFamiliesSupplier> xStyleFamiliesSupplier(getComponent(),
+                                                                         uno::UNO_QUERY);
+    uno::Reference<container::XNameAccess> xStyleFamilies
+        = xStyleFamiliesSupplier->getStyleFamilies();
+    uno::Reference<container::XNameAccess> xStyleFamily(
+        xStyleFamilies->getByName("ParagraphStyles"), uno::UNO_QUERY);
+    uno::Reference<beans::XPropertySet> xStyle(xStyleFamily->getByName("Heading 1"),
+                                               uno::UNO_QUERY);
+    OUString aFollowStyle;
+    xStyle->getPropertyValue("FollowStyle") >>= aFollowStyle;
+    // Without the accompanying fix in place, this test would have failed with:
+    // - Expected: Standard
+    // - Actual  : Heading 1
+    // i.e. \snext was ignored.
+    CPPUNIT_ASSERT_EQUAL(OUString("Standard"), aFollowStyle);
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

writerfilter/source/rtftok/rtfdispatchvalue.cxx

@@ -131,6 +131,10 @@ bool RTFDocumentImpl::dispatchTableSprmValue(RTFKeyword nKeyword, int nParam)
             nSprm = NS_ooxml::LN_CT_Style_basedOn;
             pIntValue = new RTFValue(getStyleName(nParam));
             break;
+        case RTFKeyword::SNEXT:
+            nSprm = NS_ooxml::LN_CT_Style_next;
+            pIntValue = new RTFValue(getStyleName(nParam));
+            break;
         default:
             break;
     }