tdf#147583 sw find: fix backwards search for emptyPara/endOfPara

A comment added 10 years ago thought that it had never worked.

The very last paragraph end cannot be selected manually,
and so of course it can't work in find either.
It didn't work earlier either.

Everything goes ballistic if searching inside comments,
but that would be handled elsewhere anyway I guess.
It didn't work earlier either.

Keeping the search "inside the selection" didn't work earlier either.
That should be fixed now.

make CppunitTest_sw_uiwriter7 \
    CPPUNIT_TEST_NAME=testTdf147583_backwardSearch

Change-Id: I48a72084d277b8c270255de9296a2743162937cf
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/164892
Tested-by: Jenkins
Reviewed-by: Justin Luth <jluth@mail.com>
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/164982
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
(cherry picked from commit 2f5b9916baaf0017ece84bf867a9e9acfe86d61a)
(cherry picked from commit 098a2536d08a18981032273b55e287bd231dc58e)

3 files changed, 68 insertions, 32 deletions

diff --git a/sw/qa/extras/uiwriter/data/tdf147583_backwardSearch.odt b/sw/qa/extras/uiwriter/data/tdf147583_backwardSearch.odt
new file mode 100644
index 000000000000..9bfde3bfaa6b
--- /dev/null
+++ b/sw/qa/extras/uiwriter/data/tdf147583_backwardSearch.odt
diff --git a/sw/qa/extras/uiwriter/uiwriter4.cxx b/sw/qa/extras/uiwriter/uiwriter4.cxx
index 803c4821e4a5..e9e6eb2bd148 100644
--- a/sw/qa/extras/uiwriter/uiwriter4.cxx
+++ b/sw/qa/extras/uiwriter/uiwriter4.cxx
@@ -293,6 +293,7 @@ public:
     void testTdf143760WrapContourToOff();
     void testHatchFill();
     void testTdf62032ApplyStyle();
+    void testTdf147583_backwardSearch();
 
     CPPUNIT_TEST_SUITE(SwUiWriterTest4);
     CPPUNIT_TEST(testTdf96515);
@@ -419,6 +420,7 @@ public:
     CPPUNIT_TEST(testTdf143760WrapContourToOff);
     CPPUNIT_TEST(testHatchFill);
     CPPUNIT_TEST(testTdf62032ApplyStyle);
+    CPPUNIT_TEST(testTdf147583_backwardSearch);
     CPPUNIT_TEST_SUITE_END();
 };
 
@@ -4162,6 +4164,37 @@ void SwUiWriterTest4::testTdf62032ApplyStyle()
                          getProperty<OUString>(getParagraph(2), "ListLabelString").trim());
 }
 
+void SwUiWriterTest4::testTdf147583_backwardSearch()
+{
+    createSwDoc(DATA_DIRECTORY, "tdf147583_backwardSearch.odt");
+    uno::Reference<util::XSearchable> xSearch(mxComponent, uno::UNO_QUERY);
+    uno::Reference<util::XSearchDescriptor> xSearchDes = xSearch->createSearchDescriptor();
+    uno::Reference<util::XPropertyReplace> xProp(xSearchDes, uno::UNO_QUERY);
+
+    uno::Reference<container::XIndexAccess> xIndex;
+    const sal_Int32 nParas = getParagraphs();
+
+    //specifying the search attributes
+    uno::Reference<beans::XPropertySet> xPropSet(xSearchDes, uno::UNO_QUERY_THROW);
+    xSearchDes->setPropertyValue("SearchRegularExpression", uno::Any(true)); // regex
+    xSearchDes->setSearchString("$"); // the end of the paragraph pilcrow marker
+
+    // xSearchDes->setPropertyValue("SearchBackwards", uno::Any(false));
+    // xIndex.set(xSearch->findAll(xSearchDes), uno::UNO_SET_THROW);
+    // // all paragraphs (including the unselected last one) should be found
+    // CPPUNIT_ASSERT_EQUAL(nParas, xIndex->getCount());
+
+    xSearchDes->setPropertyValue("SearchBackwards", uno::Any(true));
+    xIndex.set(xSearch->findAll(xSearchDes), uno::UNO_SET_THROW);
+    // all paragraphs (except the troublesome last one) are found
+    CPPUNIT_ASSERT_EQUAL(nParas - 1, xIndex->getCount());
+
+    xSearchDes->setSearchString("^$"); // empty paragraphs
+    xIndex.set(xSearch->findAll(xSearchDes), uno::UNO_SET_THROW);
+    // should actually be 10 (including the empty para with the comment marker, and the last para)
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(8), xIndex->getCount());
+}
+
 CPPUNIT_TEST_SUITE_REGISTRATION(SwUiWriterTest4);
 CPPUNIT_PLUGIN_IMPLEMENT();
 
diff --git a/sw/source/core/crsr/findtxt.cxx b/sw/source/core/crsr/findtxt.cxx
index 6e29c3614e55..1f2d130f7147 100644
--- a/sw/source/core/crsr/findtxt.cxx
+++ b/sw/source/core/crsr/findtxt.cxx
@@ -735,7 +735,6 @@ bool DoSearch(SwPaM & rSearchPam,
         SwRootFrame const*const pLayout, SwPaM* pPam)
 {
     bool bFound = false;
-    SwNodeIndex& rNdIdx = pPam->GetPoint()->nNode;
     OUString sCleanStr;
     std::vector<AmbiguousIndex> aFltArr;
     LanguageType eLastLang = LANGUAGE_SYSTEM;
@@ -876,39 +875,43 @@ bool DoSearch(SwPaM & rSearchPam,
 
     if ( bFound )
         return true;
-    else if ((bChkEmptyPara && !nStart.GetAnyIndex() && !nTextLen.GetAnyIndex())
-             || bChkParaEnd)
+
+    if (!bChkEmptyPara && !bChkParaEnd)
+        return false;
+
+    if (bChkEmptyPara && bSrchForward && nTextLen.GetAnyIndex())
+        return false; // the length is not zero - there is content here
+
+    // move to the end (or start) of the paragraph
+    *rSearchPam.GetPoint() = *pPam->GetPoint();
+    if (pLayout)
     {
-        *rSearchPam.GetPoint() = *pPam->GetPoint();
-        if (pLayout)
-        {
-            *rSearchPam.GetPoint() = pFrame->MapViewToModelPos(
-                bChkParaEnd ? nTextLen.GetFrameIndex() : TextFrameIndex(0));
-        }
-        else
-        {
-            rSearchPam.GetPoint()->nContent = bChkParaEnd ? nTextLen.GetModelIndex() : 0;
-        }
-        rSearchPam.SetMark();
-        const SwNode *const pSttNd = bSrchForward
-            ? &rSearchPam.GetPoint()->nNode.GetNode() // end of the frame
-            : &rNdIdx.GetNode(); // keep the bug as-is for now...
-        /* FIXME: this condition does not work for !bSrchForward backward
-         * search, it probably never did. (pSttNd != &rNdIdx.GetNode())
-         * is never true in this case. */
-        if( (bSrchForward || pSttNd != &rNdIdx.GetNode()) &&
-            rSearchPam.Move(fnMoveForward, GoInContent) &&
-            (!bSrchForward || pSttNd != &rSearchPam.GetPoint()->nNode.GetNode()) &&
-            SwNodeOffset(1) == abs(rSearchPam.GetPoint()->nNode.GetIndex() -
-                                   rSearchPam.GetMark()->nNode.GetIndex()))
-        {
-            // if backward search, switch point and mark
-            if( !bSrchForward )
-                rSearchPam.Exchange();
-            return true;
-        }
+        *rSearchPam.GetPoint() = pFrame->MapViewToModelPos(
+            bSrchForward ? nTextLen.GetFrameIndex() : TextFrameIndex(0));
     }
-    return bFound;
+    else
+    {
+        rSearchPam.GetPoint()->nContent = bSrchForward ? nTextLen.GetModelIndex() : 0;
+    }
+    rSearchPam.SetMark();
+
+    if (!rSearchPam.Move(fnMove, GoInContent))
+        return false; // at start or end of the document
+
+    // selection must not be outside of the search area
+    if (!pPam->ContainsPosition(*rSearchPam.GetPoint()))
+        return false;
+
+    if (SwNodeOffset(1) == abs(rSearchPam.GetPoint()->nNode.GetIndex() -
+                               rSearchPam.GetMark()->nNode.GetIndex()))
+    {
+        if (bChkEmptyPara && !bSrchForward && rSearchPam.GetPoint()->nContent.GetIndex())
+            return false; // the length is not zero - there is content here
+
+        return true;
+    }
+
+    return false;
 }
 
 namespace {