tdf#118845: make HiddenPara have higher priority deciding visibility

Otherwise, a Database field in a paragraph which is non-empty would
force the paragraph to be visible, regardless of HiddenPara field
telling it to be hidden.

Regression from commit db04be037b611e296ef9f2542322c52ed82d7a2b

Change-Id: I21807e22bd339fd1ea0aaa3b382579f688903418
Reviewed-on: https://gerrit.libreoffice.org/59792
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

3 files changed, 40 insertions, 19 deletions

diff --git a/sw/source/core/doc/doc.cxx b/sw/source/core/doc/doc.cxx
index c98ea37d955a..ed90bf3e2fcb 100644
--- a/sw/source/core/doc/doc.cxx
+++ b/sw/source/core/doc/doc.cxx
@@ -1358,17 +1358,20 @@ bool HandleHidingField(SwFormatField& rFormatField, const SwNodes& rNodes,
 }
 }
 
-bool SwDoc::FieldCanHidePara(SwFieldIds eFieldId) const
+// The greater the returned value, the more weight has this field type on deciding the final
+// paragraph state
+int SwDoc::FieldCanHideParaWeight(SwFieldIds eFieldId) const
 {
     switch (eFieldId)
     {
         case SwFieldIds::HiddenPara:
-            return true;
+            return 20;
         case SwFieldIds::Database:
-            return GetDocumentSettingManager().get(
-                DocumentSettingId::EMPTY_DB_FIELD_HIDES_PARA);
+            return GetDocumentSettingManager().get(DocumentSettingId::EMPTY_DB_FIELD_HIDES_PARA)
+                       ? 10
+                       : 0;
         default:
-            return false;
+            return 0;
     }
 }
 
@@ -1379,7 +1382,8 @@ bool SwDoc::FieldHidesPara(const SwField& rField) const
         case SwFieldIds::HiddenPara:
             return static_cast<const SwHiddenParaField&>(rField).IsHidden();
         case SwFieldIds::Database:
-            return FieldCanHidePara(SwFieldIds::Database) && rField.ExpandField(true).isEmpty();
+            return FieldCanHideParaWeight(SwFieldIds::Database)
+                   && rField.ExpandField(true).isEmpty();
         default:
             return false;
     }
@@ -1411,7 +1415,7 @@ bool SwDoc::RemoveInvisibleContent()
         std::vector<std::unique_ptr<FieldTypeGuard>> aHidingFieldTypes;
         for (SwFieldType* pType : *getIDocumentFieldsAccess().GetFieldTypes())
         {
-            if (FieldCanHidePara(pType->Which()))
+            if (FieldCanHideParaWeight(pType->Which()))
                 aHidingFieldTypes.push_back(o3tl::make_unique<FieldTypeGuard>(pType));
         }
         for (const auto& pTypeGuard : aHidingFieldTypes)
diff --git a/sw/source/core/text/txtfrm.cxx b/sw/source/core/text/txtfrm.cxx
index 402474391a44..6d83d3285c97 100644
--- a/sw/source/core/text/txtfrm.cxx
+++ b/sw/source/core/text/txtfrm.cxx
@@ -1045,18 +1045,25 @@ bool SwTextFrame::IsHiddenNow() const
         }
         sw::MergedAttrIter iter(*this);
         SwTextNode const* pNode(nullptr);
+        int nNewResultWeight = 0;
         for (SwTextAttr const* pHint = iter.NextAttr(&pNode); pHint; pHint = iter.NextAttr(&pNode))
         {
             if (pHint->Which() == RES_TXTATR_FIELD)
             {
+                // see also SwpHints::CalcHiddenParaField()
                 const SwFormatField& rField = pHint->GetFormatField();
-                if (pNode->FieldCanHidePara(rField.GetField()->GetTyp()->Which()))
+                int nCurWeight = pNode->FieldCanHideParaWeight(rField.GetField()->GetTyp()->Which());
+                if (nCurWeight > nNewResultWeight)
                 {
+                    nNewResultWeight = nCurWeight;
+                    bHiddenParaField = pNode->FieldHidesPara(*rField.GetField());
+                }
+                else if (nCurWeight == nNewResultWeight && bHiddenParaField)
+                {
+                    // Currently, for both supported hiding types (HiddenPara, Database), "Don't hide"
+                    // takes precedence - i.e., if there's a "Don't hide" field of that weight, we only
+                    // care about fields of higher weight.
                     bHiddenParaField = pNode->FieldHidesPara(*rField.GetField());
-                    if (!bHiddenParaField)
-                    {
-                        break; // not hidden, see CalcHiddenParaField()
-                    }
                 }
             }
         }
diff --git a/sw/source/core/txtnode/thints.cxx b/sw/source/core/txtnode/thints.cxx
index 3e2049cf2337..cf6cade9344e 100644
--- a/sw/source/core/txtnode/thints.cxx
+++ b/sw/source/core/txtnode/thints.cxx
@@ -1156,7 +1156,7 @@ void SwTextNode::DestroyAttr( SwTextAttr* pAttr )
                 // certain fields must update the SwDoc's calculation flags
 
                 // Certain fields (like HiddenParaField) must trigger recalculation of visible flag
-                if (FieldCanHidePara(pFieldType->Which()))
+                if (FieldCanHideParaWeight(pFieldType->Which()))
                     SetCalcHiddenParaField();
 
                 switch( pFieldType->Which() )
@@ -1466,7 +1466,8 @@ bool SwTextNode::InsertHint( SwTextAttr * const pAttr, const SetAttrMode nMode )
             case RES_TXTATR_FIELD:
                 {
                     // trigger notification for relevant fields, like HiddenParaFields
-                    if (FieldCanHidePara(pAttr->GetFormatField().GetField()->GetTyp()->Which()))
+                    if (FieldCanHideParaWeight(
+                            pAttr->GetFormatField().GetField()->GetTyp()->Which()))
                     {
                         bHiddenPara = true;
                     }
@@ -2591,6 +2592,7 @@ bool SwpHints::CalcHiddenParaField() const
     m_bCalcHiddenParaField = false;
     const bool bOldHiddenByParaField = m_bHiddenByParaField;
     bool bNewHiddenByParaField = false;
+    int nNewResultWeight = 0;
     const size_t nSize = Count();
     const SwTextAttr* pTextHt;
 
@@ -2601,12 +2603,20 @@ bool SwpHints::CalcHiddenParaField() const
 
         if (RES_TXTATR_FIELD == nWhich)
         {
+            // see also SwTextFrame::IsHiddenNow()
             const SwFormatField& rField = pTextHt->GetFormatField();
-            if (m_rParent.FieldCanHidePara(rField.GetField()->GetTyp()->Which())
-                && !(bNewHiddenByParaField = m_rParent.FieldHidesPara(*rField.GetField())))
+            int nCurWeight = m_rParent.FieldCanHideParaWeight(rField.GetField()->GetTyp()->Which());
+            if (nCurWeight > nNewResultWeight)
             {
-                // If there's at least one field telling not to hide, so be it
-                break;
+                nNewResultWeight = nCurWeight;
+                bNewHiddenByParaField = m_rParent.FieldHidesPara(*rField.GetField());
+            }
+            else if (nCurWeight == nNewResultWeight && bNewHiddenByParaField)
+            {
+                // Currently, for both supported hiding types (HiddenPara, Database), "Don't hide"
+                // takes precedence - i.e., if there's a "Don't hide" field of that weight, we only
+                // care about fields of higher weight.
+                bNewHiddenByParaField = m_rParent.FieldHidesPara(*rField.GetField());
             }
         }
     }
@@ -3288,7 +3298,7 @@ void SwpHints::DeleteAtPos( const size_t nPos )
             pTextField->ChgTextNode(nullptr);
         }
         else if (m_bHiddenByParaField
-                 && m_rParent.FieldCanHidePara(pFieldTyp->Which()))
+                 && m_rParent.FieldCanHideParaWeight(pFieldTyp->Which()))
         {
             m_bCalcHiddenParaField = true;
         }