sd: Reduce the number of possible intermediate allocations

... by reserving enough space at once.

As the length of these vectors depends/grows on user's input,
this change can be a micro optimization.

Change-Id: I1baa7d1433875491e86403d727f11f676d29a833
Reviewed-on: https://gerrit.libreoffice.org/56346
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

sd/source/ui/animations/CustomAnimationPane.cxx

@@ -1778,8 +1778,8 @@ void CustomAnimationPane::onAdd()
         maViewSelection >>= xShapes;
 
         sal_Int32 nCount = xShapes->getCount();
-        sal_Int32 nIndex;
-        for( nIndex = 0; nIndex < nCount; nIndex++ )
+        aTargets.reserve( nCount );
+        for( sal_Int32 nIndex = 0; nIndex < nCount; nIndex++ )
         {
             Any aTarget( xShapes->getByIndex( nIndex ) );
             aTargets.push_back( aTarget );

sd/source/ui/view/viewshel.cxx

@@ -1168,7 +1168,7 @@ void ViewShell::ImpGetUndoStrings(SfxItemSet &rSet) const
         {
             // prepare list
             std::vector<OUString> aStringList;
-
+            aStringList.reserve(nCount);
             for (sal_uInt16 a = 0; a < nCount; ++a)
             {
                 // generate one String in list per undo step
@@ -1195,9 +1195,8 @@ void ViewShell::ImpGetRedoStrings(SfxItemSet &rSet) const
         {
             // prepare list
             ::std::vector< OUString > aStringList;
-            sal_uInt16 a;
-
-            for( a = 0; a < nCount; a++)
+            aStringList.reserve(nCount);
+            for(sal_uInt16 a = 0; a < nCount; a++)
                 // generate one String in list per undo step
                 aStringList.push_back( pUndoManager->GetRedoActionComment(a) );