tdf#91260: cleanup - textboxes extending beyond the page

Storing Undo data is unnecessary here, because shrinking is applied
only on the  text frame of the textbox. The shape component of the
textbox isn't modified.

Change-Id: Iaff64ff4953adbfa830832da146343cef2734547

sw/source/core/objectpositioning/anchoredobjectposition.cxx

@@ -482,13 +482,10 @@ SwTwips SwAnchoredObjectPosition::_ImplAdjustVertRelPos( const SwTwips nTopOfAnc
             {
                 // shrink textboxes to extend beyond the page bottom
                 SwFrameFormat* pFrameFormat = ::FindFrameFormat(&GetObject());
-                SfxItemSet aTextBoxSet(pFrameFormat->GetDoc()->GetAttrPool(), aFrameFormatSetRange);
                 SwFormatFrmSize aSize(pFormat->GetFrmSize());
                 SwTwips nShrinked = aSize.GetHeight() - (nProposedRelPosY - nAdjustedRelPosY);
                 aSize.SetHeight( nShrinked > 0 ? nShrinked : 0 );
-                aTextBoxSet.Put(aSize);
-                if (aTextBoxSet.Count())
-                    pFrameFormat->GetDoc()->SetFlyFrmAttr(*pFrameFormat, aTextBoxSet);
+                pFrameFormat->SetFormatAttr(aSize);
                 nAdjustedRelPosY = nProposedRelPosY;
             } else if ( SwTextBoxHelper::findTextBox(pFormat) )
                 // when the shape has a textbox, use only the proposed vertical position