tdf#156419 sw: layout: don't prevent moving between linked flys

... when there is a page break on the next page.

Of course you can put a section into a fly, and then link multiple flys.

(regression from commit 325fe7ab507fd8f2ca17a3db32181edf30169525)

Change-Id: I5cb854fc7ee5caa2af4e04f4da2d8a8083c0d007
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/155842
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
diff --git a/sw/qa/extras/layout/data/linked_frames_section_bug.odt b/sw/qa/extras/layout/data/linked_frames_section_bug.odt
new file mode 100644
index 0000000..639332a
--- /dev/null
+++ b/sw/qa/extras/layout/data/linked_frames_section_bug.odt
Binary files differ
diff --git a/sw/qa/extras/layout/layout3.cxx b/sw/qa/extras/layout/layout3.cxx
index 9c75ff3..4ddb46b 100644
--- a/sw/qa/extras/layout/layout3.cxx
+++ b/sw/qa/extras/layout/layout3.cxx
@@ -1228,6 +1228,24 @@ CPPUNIT_TEST_FIXTURE(SwLayoutWriter3, testTdf156725)
                "/root/page[2]/body/txt/anchored/fly/column[2]/body/section/column[2]/body/txt", 1);
}

CPPUNIT_TEST_FIXTURE(SwLayoutWriter3, testTdf156419)
{
    createSwDoc("linked_frames_section_bug.odt");

    xmlDocUniquePtr pXmlDoc = parseLayoutDump();
    assertXPath(pXmlDoc, "/root/page", 2);
    // there are 2 flys on page 1, and 1 on page 2, all linked
    assertXPath(pXmlDoc, "/root/page[1]/body/txt/anchored/fly[1]/section/column", 2);
    assertXPath(pXmlDoc, "/root/page[1]/body/txt/anchored/fly[1]/section/column[1]/body/txt", 11);
    assertXPath(pXmlDoc, "/root/page[1]/body/txt/anchored/fly[1]/section/column[2]/body/txt", 11);
    assertXPath(pXmlDoc, "/root/page[1]/body/txt/anchored/fly[2]/section/column", 2);
    assertXPath(pXmlDoc, "/root/page[1]/body/txt/anchored/fly[2]/section/column[1]/body/txt", 12);
    assertXPath(pXmlDoc, "/root/page[1]/body/txt/anchored/fly[2]/section/column[2]/body/txt", 12);
    assertXPath(pXmlDoc, "/root/page[2]/body/txt/anchored/fly[1]/section/column", 2);
    assertXPath(pXmlDoc, "/root/page[2]/body/txt/anchored/fly[1]/section/column[1]/body/txt", 2);
    assertXPath(pXmlDoc, "/root/page[2]/body/txt/anchored/fly[1]/section/column[2]/body/txt", 1);
}

CPPUNIT_TEST_FIXTURE(SwLayoutWriter3, testTdf145826)
{
    createSwDoc("tdf145826.odt");
diff --git a/sw/source/core/layout/sectfrm.cxx b/sw/source/core/layout/sectfrm.cxx
index 9023550..7afcb6b 100644
--- a/sw/source/core/layout/sectfrm.cxx
+++ b/sw/source/core/layout/sectfrm.cxx
@@ -1758,6 +1758,7 @@ SwLayoutFrame *SwFrame::GetNextSctLeaf( MakePageType eMakePage )
            // creating / moving the cell frame.
            // It doesn't make sense to move to a page that starts with break?
            if (pNxtPg != FindPageFrame() // tdf#156725 not between columns!
                && !FindFlyFrame() // tdf#156419 linked fly frames don't care!
                && (WrongPageDesc(pNxtPg) || HasPageBreakBefore(*pNxtPg))
                && !bLayLeafTableAllowed)
            {