sw: fix expansion of SetGetExpField in headers with split table rows

The problem is that a get field in a header on page N may calculate and
show values that do not take into account a set field on page N-1.

This happens if a table row with multiple columns is split across the
pages: SwGetExpField::ChangeExpansion() calls GetBodyTextNode(), which
returns the first node in the first column that is on page N, but in the
SwNodes array this node is *before* any node in columns 2..M, any of
which may be on page N-1 in the layout.

So try to fix this by adding a page number to SetGetExpField and using
that as the highest priority in operator<().

This is a bit risky because some of the places that create
SetGetExpField don't have a frame to get the page number from; try to
adapt all that call into MakeFieldList(), while leaving unrelated ones
such as in MakeSetList() unchanged.

Change-Id: Ied2a897ad34f0faf1ef3d50baad07b23fafd49bd
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/132641
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
(cherry picked from commit 9dc6e2c9062725ef1f9d7e321cae5f4dbe8ca749)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/132645
Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>

2 files changed, 343 insertions, 0 deletions

diff --git a/sw/qa/extras/uiwriter/data/variable-field-table-row-split-header.fodt b/sw/qa/extras/uiwriter/data/variable-field-table-row-split-header.fodt
new file mode 100644
index 000000000000..9d3668b6b2ee
--- /dev/null
+++ b/sw/qa/extras/uiwriter/data/variable-field-table-row-split-header.fodt
@@ -0,0 +1,270 @@
+<?xml version='1.0' encoding='UTF-8'?>
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+  </style:page-layout>
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+  </number:number-style>
+ </office:automatic-styles>
+ <office:master-styles>
+  <style:master-page style:name="Standard" style:page-layout-name="pm1">
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+    <text:p text:style-name="Header"><text:variable-get text:name="CARRYOVER_VALUE" style:data-style-name="N0">4</text:variable-get></text:p>
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+   <style:footer>
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+    <text:sequence-decl text:display-outline-level="0" text:name="Drawing"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Figure"/>
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+     </table:table-cell>
+    </table:table-row>
+    <table:table-row table:style-name="TableLine213872096">
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+      <text:p text:style-name="Table_20_Contents"><text:variable-get text:name="CARRYOVER_VALUE" style:data-style-name="N0">2</text:variable-get><text:variable-set text:name="CARRYOVER_VALUE" office:value-type="float" office:value="3" style:data-style-name="N0">3</text:variable-set><text:variable-get text:name="CARRYOVER_VALUE" style:data-style-name="N0">3</text:variable-get></text:p>
+     </table:table-cell>
+    </table:table-row>
+    <table:table-row table:style-name="TableLine213872096">
+     <table:table-cell table:style-name="Table1.A2" office:value-type="string">
+      <text:p text:style-name="Table_20_Contents"/>
+     </table:table-cell>
+     <table:table-cell table:style-name="Table1.B2" office:value-type="string">
+      <text:p text:style-name="Table_20_Contents"><text:variable-get text:name="CARRYOVER_VALUE" style:data-style-name="N0">3</text:variable-get><text:variable-set text:name="CARRYOVER_VALUE" office:value-type="float" office:value="4" style:data-style-name="N0">4</text:variable-set><text:variable-get text:name="CARRYOVER_VALUE" style:data-style-name="N0">4</text:variable-get></text:p>
+     </table:table-cell>
+    </table:table-row>
+   </table:table>
+   <text:p text:style-name="Standard"/>
+   <text:p text:style-name="Standard"/>
+   <text:p text:style-name="P1"/>
+  </office:text>
+ </office:body>
+</office:document>
\ No newline at end of file
diff --git a/sw/qa/extras/uiwriter/uiwriter3.cxx b/sw/qa/extras/uiwriter/uiwriter3.cxx
index 13d62a49ef58..03b2bc92b307 100644
--- a/sw/qa/extras/uiwriter/uiwriter3.cxx
+++ b/sw/qa/extras/uiwriter/uiwriter3.cxx
@@ -84,6 +84,79 @@ CPPUNIT_TEST_FIXTURE(SwUiWriterTest3, testTdf145731)
     CPPUNIT_ASSERT_EQUAL(1, getPages());
 }
 
+CPPUNIT_TEST_FIXTURE(SwUiWriterTest3, testVariableFieldTableRowSplitHeader)
+{
+    SwDoc* const pDoc = createSwDoc(DATA_DIRECTORY, "variable-field-table-row-split-header.fodt");
+
+    // finish layout
+    Scheduler::ProcessEventsToIdle();
+    xmlDocUniquePtr pXmlDoc = parseLayoutDump();
+
+    // the fields in cell are: variable-get variable-set variable-get
+    assertXPath(pXmlDoc, "/root/page[1]/body/tab/row[1]/cell[2]/txt[1]/Special", 3);
+    assertXPath(pXmlDoc, "/root/page[1]/body/tab/row[1]/cell[2]/txt[1]/Special[1]", "rText", "0");
+    assertXPath(pXmlDoc, "/root/page[1]/body/tab/row[1]/cell[2]/txt[1]/Special[2]", "rText", "1");
+    assertXPath(pXmlDoc, "/root/page[1]/body/tab/row[1]/cell[2]/txt[1]/Special[3]", "rText", "1");
+    assertXPath(pXmlDoc, "/root/page[1]/header/txt[1]/Special[1]", "rText", "0");
+    assertXPath(pXmlDoc, "/root/page[1]/footer/txt[1]/Special[1]", "rText", "1");
+    // here the header had shown the wrong value
+    assertXPath(pXmlDoc, "/root/page[2]/body/tab/row[2]/cell[2]/txt[1]/Special[1]", "rText", "1");
+    assertXPath(pXmlDoc, "/root/page[2]/body/tab/row[2]/cell[2]/txt[1]/Special[2]", "rText", "2");
+    assertXPath(pXmlDoc, "/root/page[2]/body/tab/row[2]/cell[2]/txt[1]/Special[3]", "rText", "2");
+    assertXPath(pXmlDoc, "/root/page[2]/header/txt[1]/Special[1]", "rText", "1");
+    assertXPath(pXmlDoc, "/root/page[2]/footer/txt[1]/Special[1]", "rText", "2");
+
+    assertXPath(pXmlDoc, "/root/page[3]/body/tab/row[2]/cell[2]/txt[1]/Special[1]", "rText", "2");
+    assertXPath(pXmlDoc, "/root/page[3]/body/tab/row[2]/cell[2]/txt[1]/Special[2]", "rText", "3");
+    assertXPath(pXmlDoc, "/root/page[3]/body/tab/row[2]/cell[2]/txt[1]/Special[3]", "rText", "3");
+    assertXPath(pXmlDoc, "/root/page[3]/header/txt[1]/Special[1]", "rText", "2");
+    assertXPath(pXmlDoc, "/root/page[3]/footer/txt[1]/Special[1]", "rText", "3");
+
+    assertXPath(pXmlDoc, "/root/page[4]/body/tab/row[2]/cell[2]/txt[1]/Special[1]", "rText", "3");
+    assertXPath(pXmlDoc, "/root/page[4]/body/tab/row[2]/cell[2]/txt[1]/Special[2]", "rText", "4");
+    assertXPath(pXmlDoc, "/root/page[4]/body/tab/row[2]/cell[2]/txt[1]/Special[3]", "rText", "4");
+    assertXPath(pXmlDoc, "/root/page[4]/header/txt[1]/Special[1]", "rText", "3");
+    assertXPath(pXmlDoc, "/root/page[4]/footer/txt[1]/Special[1]", "rText", "4");
+
+    assertXPath(pXmlDoc, "/root/page[5]/header/txt[1]/Special[1]", "rText", "4");
+    assertXPath(pXmlDoc, "/root/page[5]/footer/txt[1]/Special[1]", "rText", "4");
+
+    discardDumpedLayout();
+    // update and check again
+    pDoc->getIDocumentFieldsAccess().UpdateFields(true);
+    Scheduler::ProcessEventsToIdle();
+    pXmlDoc = parseLayoutDump();
+
+    // the fields in cell are: variable-get variable-set variable-get
+    assertXPath(pXmlDoc, "/root/page[1]/body/tab/row[1]/cell[2]/txt[1]/Special", 3);
+    assertXPath(pXmlDoc, "/root/page[1]/body/tab/row[1]/cell[2]/txt[1]/Special[1]", "rText", "0");
+    assertXPath(pXmlDoc, "/root/page[1]/body/tab/row[1]/cell[2]/txt[1]/Special[2]", "rText", "1");
+    assertXPath(pXmlDoc, "/root/page[1]/body/tab/row[1]/cell[2]/txt[1]/Special[3]", "rText", "1");
+    assertXPath(pXmlDoc, "/root/page[1]/header/txt[1]/Special[1]", "rText", "0");
+    assertXPath(pXmlDoc, "/root/page[1]/footer/txt[1]/Special[1]", "rText", "1");
+    // here the header had shown the wrong value
+    assertXPath(pXmlDoc, "/root/page[2]/body/tab/row[2]/cell[2]/txt[1]/Special[1]", "rText", "1");
+    assertXPath(pXmlDoc, "/root/page[2]/body/tab/row[2]/cell[2]/txt[1]/Special[2]", "rText", "2");
+    assertXPath(pXmlDoc, "/root/page[2]/body/tab/row[2]/cell[2]/txt[1]/Special[3]", "rText", "2");
+    assertXPath(pXmlDoc, "/root/page[2]/header/txt[1]/Special[1]", "rText", "1");
+    assertXPath(pXmlDoc, "/root/page[2]/footer/txt[1]/Special[1]", "rText", "2");
+
+    assertXPath(pXmlDoc, "/root/page[3]/body/tab/row[2]/cell[2]/txt[1]/Special[1]", "rText", "2");
+    assertXPath(pXmlDoc, "/root/page[3]/body/tab/row[2]/cell[2]/txt[1]/Special[2]", "rText", "3");
+    assertXPath(pXmlDoc, "/root/page[3]/body/tab/row[2]/cell[2]/txt[1]/Special[3]", "rText", "3");
+    assertXPath(pXmlDoc, "/root/page[3]/header/txt[1]/Special[1]", "rText", "2");
+    assertXPath(pXmlDoc, "/root/page[3]/footer/txt[1]/Special[1]", "rText", "3");
+
+    assertXPath(pXmlDoc, "/root/page[4]/body/tab/row[2]/cell[2]/txt[1]/Special[1]", "rText", "3");
+    assertXPath(pXmlDoc, "/root/page[4]/body/tab/row[2]/cell[2]/txt[1]/Special[2]", "rText", "4");
+    assertXPath(pXmlDoc, "/root/page[4]/body/tab/row[2]/cell[2]/txt[1]/Special[3]", "rText", "4");
+    assertXPath(pXmlDoc, "/root/page[4]/header/txt[1]/Special[1]", "rText", "3");
+    assertXPath(pXmlDoc, "/root/page[4]/footer/txt[1]/Special[1]", "rText", "4");
+
+    assertXPath(pXmlDoc, "/root/page[5]/header/txt[1]/Special[1]", "rText", "4");
+    assertXPath(pXmlDoc, "/root/page[5]/footer/txt[1]/Special[1]", "rText", "4");
+}
+
 CPPUNIT_TEST_FIXTURE(SwUiWriterTest3, testTdf129382)
 {
     SwDoc* pDoc = createSwDoc(DATA_DIRECTORY, "tdf129382.docx");