crashtesting: crash on reimport of xlsx output of forum-pl-2758.ods

also seen as a leak as nothing is erased by:

maRegisteredCellAttributes.erase(&rCandidate);

once the style names are changed and the std::set isn't ordered
according to its predicate anymore.

Easiest thing to do here seems to run the rename of a cell style through
CellAttributeHelper so it can reinsert the affected ScPatternAttrs

Change-Id: I13486701f378228792baa2b378709b7d530c3770
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/182743
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>
Tested-by: Jenkins

sc/inc/patattr.hxx

@@ -92,6 +92,7 @@ public:
 
     void CellStyleDeleted(const ScStyleSheet& rStyle);
     void CellStyleCreated(ScDocument& rDoc, const OUString& rName);
+    void RenameCellStyle(ScStyleSheet& rStyle, const OUString& rNewName);
     void UpdateAllStyleSheets(ScDocument& rDoc);
     void AllStylesToNames();
     void ReIndexRegistered();

sc/inc/stlpool.hxx

@@ -56,6 +56,9 @@ public:
     // Finds Para style with given name case-insensitively, or STR_STYLENAME_STANDARD
     ScStyleSheet*       FindAutoStyle(const OUString& rName);
 
+    // Rename rStyle to rNewName, and update CellAttribute holder
+    SC_DLLPUBLIC void Rename(SfxStyleSheetBase& rStyle, const OUString& rNewName, SfxStyleFamily eFam);
+
     SC_DLLPUBLIC virtual SfxStyleSheetBase& Make( const OUString&, SfxStyleFamily eFam,
                                      SfxStyleSearchBits nMask = SfxStyleSearchBits::All,
                                      const OUString& rParentStyleSheetName = u""_ustr) override;

sc/source/core/data/patattr.cxx

@@ -197,6 +197,33 @@ void CellAttributeHelper::CellStyleDeleted(const ScStyleSheet& rStyle)
     }
 }
 
+void CellAttributeHelper::RenameCellStyle(ScStyleSheet& rStyle, const OUString& rNewName)
+{
+    std::vector<const ScPatternAttr*> aChanged;
+
+    const OUString& rCandidateStyleName = rStyle.GetName();
+    auto it = maRegisteredCellAttributes.lower_bound(&rCandidateStyleName);
+    while(it != maRegisteredCellAttributes.end())
+    {
+        const ScPatternAttr* pCheck = *it;
+        if (CompareStringPtr(pCheck->GetStyleName(), &rCandidateStyleName) != 0)
+            break;
+        if (&rStyle == pCheck->GetStyleSheet())
+        {
+            aChanged.push_back(pCheck);
+            // The name will change, we have to re-insert it
+            it = maRegisteredCellAttributes.erase(it);
+        }
+        else
+            ++it;
+    }
+
+    rStyle.SetName(rNewName);
+
+    for (const ScPatternAttr* p : aChanged)
+        maRegisteredCellAttributes.insert(p);
+}
+
 void CellAttributeHelper::CellStyleCreated(ScDocument& rDoc, const OUString& rName)
 {
     // If a style was created, don't keep any pattern with its name string in the pool,

sc/source/core/data/stlpool.cxx

@@ -114,6 +114,17 @@ rtl::Reference<SfxStyleSheetBase> ScStyleSheetPool::Create( const SfxStyleSheetB
     return new ScStyleSheet( static_cast<const ScStyleSheet&>(rStyle) );
 }
 
+void ScStyleSheetPool::Rename(SfxStyleSheetBase& rStyle, const OUString& rNewName, SfxStyleFamily eFamily)
+{
+    if (eFamily == SfxStyleFamily::Para)
+    {
+        assert(nullptr != pDoc);
+        pDoc->getCellAttributeHelper().RenameCellStyle(static_cast<ScStyleSheet&>(rStyle), rNewName);
+        return;
+    }
+    rStyle.SetName(rNewName);
+}
+
 void ScStyleSheetPool::Remove( SfxStyleSheetBase* pStyle )
 {
     if ( pStyle )

sc/source/filter/ftools/ftools.cxx

@@ -231,7 +231,7 @@ ScStyleSheet& lclMakeStyleSheet( ScStyleSheetPool& rPool, const OUString& rStyle
     // rename existing style
     if( pOldStyleSheet && bForceName )
     {
-        pOldStyleSheet->SetName( aNewName );
+        rPool.Rename(*pOldStyleSheet, aNewName, eFamily);
         aNewName = rStyleName;
     }