sw: layout: fix toggling Hidden Paragraphs that have follows

When a hidden paragraph is split across pages, there is nothing that
joins its follow (SwContentFrame::MakePrtArea() has code to do it but it
wasn't called even before the previous commit?) and when the follow is
formatted is doesn't move back.

So just join all follows asap in SwContentFrame::MakeAll().

(presumably regression from commit
0c96119895b347f8eb5bb89f393351bd3c02b9f1 or one of its follow-ups)

Change-Id: Icecdf17c1c1e11a3b62c7e5bf2c6624f234c94f3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/177500
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
Tested-by: Jenkins
(cherry picked from commit a60f016a89787a818e868fbfa5b714853ff44a78)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/177558
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

3 files changed, 166 insertions, 0 deletions

diff --git a/sw/qa/extras/layout/data/hidden-para-follow-frame.fodt b/sw/qa/extras/layout/data/hidden-para-follow-frame.fodt
new file mode 100644
index 000000000000..20b67c13afc9
--- /dev/null
+++ b/sw/qa/extras/layout/data/hidden-para-follow-frame.fodt
@@ -0,0 +1,113 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<office:document xmlns:officeooo="http://openoffice.org/2009/office" xmlns:css3t="http://www.w3.org/TR/css3-text/" xmlns:grddl="http://www.w3.org/2003/g/data-view#" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:chart="urn:oasis:names:tc:opendocument:xmlns:chart:1.0" xmlns:svg="urn:oasis:names:tc:opendocument:xmlns:svg-compatible:1.0" xmlns:draw="urn:oasis:names:tc:opendocument:xmlns:drawing:1.0" xmlns:rpt="http://openoffice.org/2005/report" xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" xmlns:style="urn:oasis:names:tc:opendocument:xmlns:style:1.0" xmlns:meta="urn:oasis:names:tc:opendocument:xmlns:meta:1.0" xmlns:config="urn:oasis:names:tc:opendocument:xmlns:config:1.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0" xmlns:of="urn:oasis:names:tc:opendocument:xmlns:of:1.2" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:ooo="http://openoffice.org/2004/office" xmlns:dr3d="urn:oasis:names:tc:opendocument:xmlns:dr3d:1.0" xmlns:formx="urn:openoffice:names:experimental:ooxml-odf-interop:xmlns:form:1.0" xmlns:calcext="urn:org:documentfoundation:names:experimental:calc:xmlns:calcext:1.0" xmlns:drawooo="http://openoffice.org/2010/draw" xmlns:field="urn:openoffice:names:experimental:ooo-ms-interop:xmlns:field:1.0" xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:table="urn:oasis:names:tc:opendocument:xmlns:table:1.0" xmlns:number="urn:oasis:names:tc:opendocument:xmlns:datastyle:1.0" xmlns:ooow="http://openoffice.org/2004/writer" xmlns:oooc="http://openoffice.org/2004/calc" xmlns:tableooo="http://openoffice.org/2009/table" xmlns:loext="urn:org:documentfoundation:names:experimental:office:xmlns:loext:1.0" xmlns:math="http://www.w3.org/1998/Math/MathML" xmlns:form="urn:oasis:names:tc:opendocument:xmlns:form:1.0" xmlns:script="urn:oasis:names:tc:opendocument:xmlns:script:1.0" xmlns:dom="http://www.w3.org/2001/xml-events" xmlns:xforms="http://www.w3.org/2002/xforms" office:version="1.2" office:mimetype="application/vnd.oasis.opendocument.text">
+ <office:meta><meta:creation-date>2024-11-29T14:58:14.708431006</meta:creation-date><dc:date>2024-11-29T14:59:51.787415000</dc:date><meta:editing-duration>PT1M37S</meta:editing-duration><meta:editing-cycles>1</meta:editing-cycles><meta:document-statistic meta:table-count="0" meta:image-count="0" meta:object-count="0" meta:page-count="2" meta:paragraph-count="2" meta:word-count="2" meta:character-count="6" meta:non-whitespace-character-count="6"/><meta:generator>CIB_OfficeDev/6.4.0.29$Linux_X86_64 LibreOffice_project/5374b230ff33d77a7f81d56046759f218a160036</meta:generator></office:meta>
+ <office:font-face-decls>
+  <style:font-face style:name="Liberation Serif" svg:font-family="'Liberation Serif'" style:font-family-generic="roman" style:font-pitch="variable"/>
+  <style:font-face style:name="Lucida Sans" svg:font-family="'Lucida Sans'" style:font-family-generic="system" style:font-pitch="variable"/>
+  <style:font-face style:name="Noto Serif CJK SC" svg:font-family="'Noto Serif CJK SC'" style:font-family-generic="system" style:font-pitch="variable"/>
+ </office:font-face-decls>
+ <office:styles>
+  <style:default-style style:family="graphic">
+   <style:graphic-properties svg:stroke-color="#3465a4" draw:fill-color="#729fcf" fo:wrap-option="no-wrap" draw:shadow-offset-x="0.3cm" draw:shadow-offset-y="0.3cm" draw:start-line-spacing-horizontal="0.283cm" draw:start-line-spacing-vertical="0.283cm" draw:end-line-spacing-horizontal="0.283cm" draw:end-line-spacing-vertical="0.283cm" style:flow-with-text="false"/>
+   <style:paragraph-properties style:text-autospace="ideograph-alpha" style:line-break="strict" style:writing-mode="lr-tb" style:font-independent-line-spacing="false">
+    <style:tab-stops/>
+   </style:paragraph-properties>
+   <style:text-properties style:use-window-font-color="true" style:font-name="Liberation Serif" fo:font-size="12pt" fo:language="de" fo:country="DE" style:letter-kerning="true" style:font-name-asian="Noto Serif CJK SC" style:font-size-asian="10.5pt" style:language-asian="zh" style:country-asian="CN" style:font-name-complex="Lucida Sans" style:font-size-complex="12pt" style:language-complex="hi" style:country-complex="IN"/>
+  </style:default-style>
+  <style:default-style style:family="paragraph">
+   <style:paragraph-properties fo:orphans="2" fo:widows="2" fo:hyphenation-ladder-count="no-limit" style:text-autospace="ideograph-alpha" style:punctuation-wrap="hanging" style:line-break="strict" style:tab-stop-distance="1.251cm" style:writing-mode="page"/>
+   <style:text-properties style:use-window-font-color="true" style:font-name="Liberation Serif" fo:font-size="12pt" fo:language="de" fo:country="DE" style:letter-kerning="true" style:font-name-asian="Noto Serif CJK SC" style:font-size-asian="10.5pt" style:language-asian="zh" style:country-asian="CN" style:font-name-complex="Lucida Sans" style:font-size-complex="12pt" style:language-complex="hi" style:country-complex="IN" fo:hyphenate="false" fo:hyphenation-remain-char-count="2" fo:hyphenation-push-char-count="2" loext:hyphenation-no-caps="false"/>
+  </style:default-style>
+  <style:default-style style:family="table">
+   <style:table-properties table:border-model="collapsing"/>
+  </style:default-style>
+  <style:default-style style:family="table-row">
+   <style:table-row-properties fo:keep-together="auto"/>
+  </style:default-style>
+  <style:style style:name="Standard" style:family="paragraph" style:class="text"/>
+  <text:outline-style style:name="Outline">
+   <text:outline-level-style text:level="1" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="2" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="3" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="4" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="5" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="6" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="7" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="8" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="9" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="10" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+  </text:outline-style>
+  <text:notes-configuration text:note-class="footnote" style:num-format="1" text:start-value="0" text:footnotes-position="page" text:start-numbering-at="document"/>
+  <text:notes-configuration text:note-class="endnote" style:num-format="i" text:start-value="0"/>
+  <text:linenumbering-configuration text:number-lines="false" text:offset="0.499cm" style:num-format="1" text:number-position="left" text:increment="5"/>
+ </office:styles>
+ <office:automatic-styles>
+  <style:style style:name="P1" style:family="paragraph" style:parent-style-name="Standard">
+   <style:text-properties fo:font-size="24pt" style:font-size-asian="24pt" style:font-size-complex="24pt"/>
+  </style:style>
+  <style:page-layout style:name="pm1">
+   <style:page-layout-properties fo:page-width="10.5cm" fo:page-height="14.801cm" style:num-format="1" style:print-orientation="portrait" fo:margin-top="2cm" fo:margin-bottom="2cm" fo:margin-left="2cm" fo:margin-right="2cm" style:writing-mode="lr-tb" style:footnote-max-height="0cm">
+    <style:footnote-sep style:width="0.018cm" style:distance-before-sep="0.101cm" style:distance-after-sep="0.101cm" style:line-style="solid" style:adjustment="left" style:rel-width="25%" style:color="#000000"/>
+   </style:page-layout-properties>
+   <style:header-style/>
+   <style:footer-style/>
+  </style:page-layout>
+ </office:automatic-styles>
+ <office:master-styles>
+  <style:master-page style:name="Standard" style:page-layout-name="pm1"/>
+ </office:master-styles>
+ <office:body>
+  <office:text text:use-soft-page-breaks="true">
+   <text:sequence-decls>
+    <text:sequence-decl text:display-outline-level="0" text:name="Illustration"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Table"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Text"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Drawing"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Figure"/>
+   </text:sequence-decls>
+   <text:p text:style-name="P1">Foo</text:p>
+   <text:p text:style-name="P1"><text:line-break/><text:line-break/><text:line-break/><text:line-break/><text:line-break/><text:line-break/><text:line-break/><text:line-break/><text:line-break/><text:line-break/><text:soft-page-break/><text:line-break/><text:hidden-paragraph text:condition="ooow:TRUE" text:is-hidden="true"/></text:p>
+   <text:p text:style-name="P1">Bar</text:p>
+  </office:text>
+ </office:body>
+</office:document>
\ No newline at end of file
diff --git a/sw/qa/extras/layout/layout3.cxx b/sw/qa/extras/layout/layout3.cxx
index 76193ed031fd..b144cf42015e 100644
--- a/sw/qa/extras/layout/layout3.cxx
+++ b/sw/qa/extras/layout/layout3.cxx
@@ -2165,6 +2165,55 @@ CPPUNIT_TEST_FIXTURE(SwLayoutWriter3, testTdf156724)
     assertXPath(pXmlDoc, "/root/page"_ostr, 2);
 }
 
+CPPUNIT_TEST_FIXTURE(SwLayoutWriter3, testHiddenParagraphFollowFrame)
+{
+    createSwDoc("hidden-para-follow-frame.fodt");
+
+    uno::Any aOldValue{ queryDispatchStatus(mxComponent, m_xContext, ".uno:ShowHiddenParagraphs") };
+
+    Resetter g([this, aOldValue] {
+        uno::Sequence<beans::PropertyValue> argsSH(
+            comphelper::InitPropertySequence({ { "ShowHiddenParagraphs", aOldValue } }));
+        dispatchCommand(mxComponent, ".uno:ShowHiddenParagraphs", argsSH);
+    });
+
+    uno::Sequence<beans::PropertyValue> argsSH(
+        comphelper::InitPropertySequence({ { "ShowHiddenParagraphs", uno::Any(true) } }));
+    dispatchCommand(mxComponent, ".uno:ShowHiddenParagraphs", argsSH);
+    uno::Sequence<beans::PropertyValue> args(
+        comphelper::InitPropertySequence({ { "Fieldnames", uno::Any(false) } }));
+    dispatchCommand(mxComponent, ".uno:Fieldnames", args);
+    Scheduler::ProcessEventsToIdle();
+
+    {
+        xmlDocUniquePtr pXmlDoc = parseLayoutDump();
+        assertXPath(pXmlDoc, "/root/page", 2);
+        assertXPath(pXmlDoc, "/root/page[1]/body/txt", 2);
+        assertXPath(pXmlDoc, "/root/page[2]/body/txt", 2);
+        discardDumpedLayout();
+    }
+
+    dispatchCommand(mxComponent, ".uno:ShowHiddenParagraphs", {});
+
+    {
+        xmlDocUniquePtr pXmlDoc = parseLayoutDump();
+        // the problem was that the 3rd paragraph didn't move to page 1
+        assertXPath(pXmlDoc, "/root/page", 1);
+        assertXPath(pXmlDoc, "/root/page[1]/body/txt", 3);
+        discardDumpedLayout();
+    }
+
+    dispatchCommand(mxComponent, ".uno:ShowHiddenParagraphs", {});
+
+    {
+        xmlDocUniquePtr pXmlDoc = parseLayoutDump();
+        assertXPath(pXmlDoc, "/root/page", 2);
+        assertXPath(pXmlDoc, "/root/page[1]/body/txt", 2);
+        assertXPath(pXmlDoc, "/root/page[2]/body/txt", 2);
+        discardDumpedLayout();
+    }
+}
+
 CPPUNIT_TEST_FIXTURE(SwLayoutWriter3, testSectionUnhide)
 {
     createSwDoc("hiddensection.fodt");
diff --git a/sw/source/core/layout/calcmove.cxx b/sw/source/core/layout/calcmove.cxx
index 168083f21d64..bdd54452838b 100644
--- a/sw/source/core/layout/calcmove.cxx
+++ b/sw/source/core/layout/calcmove.cxx
@@ -1287,6 +1287,10 @@ void SwContentFrame::MakeAll(vcl::RenderContext* /*pRenderContext*/)
     bool const isHiddenNow(static_cast<SwTextFrame*>(this)->IsHiddenNowImpl());
     if (isHiddenNow)
     {
+        while (HasFollow())
+        {
+            static_cast<SwTextFrame&>(*this).JoinFrame();
+        }
         MakeValidZeroHeight();
         HideAndShowObjects();
     }