tdf#64588 - prevent loss of non-uniquely-named slide

Although the UI prevents someone from renaming slides
so that two have the same name, it is still possible to
have such non-uniquely named pages apparently.  Since drag/drop
uses the name to add a slide to the clipboard, it resulted
in duplicates of the first found instance of the slidename, and
loss of the similarly-named slides when they were dragged to
a new location.

Change-Id: I2986a7c6c3360162adf9430f645d0dfc73f1d4e2
Reviewed-on: https://gerrit.libreoffice.org/32481Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Justin Luth <justin_luth@sil.org>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

sd/inc/drawdoc.hxx

@@ -355,6 +355,13 @@ public:
             SDRPAGE_NOTFOUND (=0xffff) when such a page does not exist.
     */
     SAL_DLLPRIVATE sal_uInt16 GetPageByName(const OUString& rPgName, bool& rbIsMasterPage ) const;
+    /** checks, if the given name is a *unique* name for an *existing* slide
+
+        @param rPageName the name of an existing slide
+
+        @return true, if the name is unique and the slide exists
+    */
+    bool IsPageNameUnique( const OUString& rPageName ) const;
     SdPage*GetSdPage(sal_uInt16 nPgNum, PageKind ePgKind) const;
     sal_uInt16 GetSdPageCount(PageKind ePgKind) const;
 

sd/source/core/drawdoc2.cxx

@@ -184,6 +184,43 @@ sal_uInt16 SdDrawDocument::GetPageByName(const OUString& rPgName, bool& rbIsMast
     return nPageNum;
 }
 
+bool SdDrawDocument::IsPageNameUnique( const OUString& rPgName ) const
+{
+    sal_uInt16 nCount = 0;
+    SdPage* pPage = nullptr;
+
+    // Search all regular pages and all notes pages (handout pages are ignored)
+    sal_uInt16 nPage = 0;
+    sal_uInt16 nMaxPages = GetPageCount();
+    while (nPage < nMaxPages)
+    {
+        pPage = const_cast<SdPage*>(static_cast<const SdPage*>(GetPage(nPage)));
+
+        if (pPage && pPage->GetName() == rPgName && pPage->GetPageKind() != PageKind::Handout)
+            nCount++;
+
+        nPage++;
+    }
+
+    // Search all master pages
+    nPage = 0;
+    nMaxPages = GetMasterPageCount();
+    while (nPage < nMaxPages)
+    {
+        pPage = const_cast<SdPage*>(static_cast<const SdPage*>(GetMasterPage(nPage)));
+
+        if (pPage && pPage->GetName() == rPgName)
+            nCount++;;
+
+        nPage++;
+    }
+
+    if (nCount == 1)
+        return true;
+    else
+        return false;
+}
+
 SdPage* SdDrawDocument::GetSdPage(sal_uInt16 nPgNum, PageKind ePgKind) const
 {
     return mpDrawPageListWatcher->GetSdPage(ePgKind, sal_uInt32(nPgNum));

sd/source/ui/docshell/docshel2.cxx

@@ -406,6 +406,11 @@ bool DrawDocShell::IsNewPageNameValid( OUString & rInOutPageName, bool bResetStr
     return bCanUseNewName;
 }
 
+bool DrawDocShell::IsPageNameUnique( const OUString & rPageName ) const
+{
+    return mpDoc->IsPageNameUnique(rPageName);
+}
+
 IMPL_LINK( DrawDocShell, RenameSlideHdl, AbstractSvxNameDialog&, rDialog, bool )
 {
     OUString aNewName;

sd/source/ui/inc/DrawDocShell.hxx

@@ -183,6 +183,14 @@ public:
      */
     bool                    IsNewPageNameValid( OUString & rInOutPageName, bool bResetStringIfStandardName = false );
 
+    /** checks, if the given name is a *unique* name for an *existing* slide
+
+        @param rPageName the name of an existing slide
+
+        @return true, if the name is unique and the slide exists
+    */
+    bool                    IsPageNameUnique(const OUString& rPagName) const;
+
     /** Return the reference device for the current document.  When the
         inherited implementation returns a device then this is passed to the
         caller.  Otherwise the returned value depends on the printer

sd/source/ui/slidesorter/controller/SlsClipboard.cxx

@@ -389,9 +389,26 @@ void Clipboard::CreateSlideTransferable (
     SdDrawDocument* const pDocument = mrSlideSorter.GetModel().GetDocument();
     DrawDocShell* const pDataDocSh = pDocument ? pDocument->GetDocSh() : nullptr;
 
+    sal_Int32 nUniqueID = 0;
     while (aSelectedPages.HasMoreElements())
     {
         model::SharedPageDescriptor pDescriptor (aSelectedPages.GetNextElement());
+
+        //ensure that the slides have unique names
+        const OUString sOrigName = pDescriptor->GetPage()->GetName();
+        if ( pDataDocSh && !pDataDocSh->IsPageNameUnique( sOrigName ) )
+        {
+            OUString sUniqueName;
+            bool bUnique = false;
+            while ( !bUnique )
+            {
+                sUniqueName = sOrigName + "_clipboard" + OUString::number(nUniqueID++);
+                bUnique = pDataDocSh->IsNewPageNameValid( sUniqueName );
+                if ( bUnique )
+                    pDescriptor->GetPage()->SetName(sUniqueName);
+            }
+        }
+
         aBookmarkList.push_back(pDescriptor->GetPage()->GetName());
         maPagesToRemove.push_back (pDescriptor->GetPage());
     }