tdf#113848 Sidebar: Get user-defined sizes while changing orientation

If the orientation of the page is changed, the user
defined page sizes are now accessed directly to swap the sizes
correctly.

Change-Id: I91d256d35dcd910a8c3151a3f9e669413c9a57db
Reviewed-on: https://gerrit.libreoffice.org/59577
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

sw/source/uibase/sidebar/PageFormatPanel.cxx

@@ -216,9 +216,14 @@ void PageFormatPanel::NotifyItemUpdate(
 IMPL_LINK_NOARG(PageFormatPanel, PaperFormatModifyHdl, ListBox&, void)
 {
     Paper ePaper = mpPaperSizeBox->GetSelection();
-    Size  aSize(SvxPaperInfo::GetPaperSize(ePaper, meUnit));
+    Size  aSize;
 
-    if(mpPaperOrientation->GetSelectedEntryPos() == 1)
+    if(ePaper!=PAPER_USER)
+       aSize = SvxPaperInfo::GetPaperSize(ePaper, meUnit);
+    else
+       aSize = Size(GetCoreValue( *mpPaperWidth, meUnit ), GetCoreValue( *mpPaperHeight, meUnit));
+
+    if(mpPaperOrientation->GetSelectedEntryPos() == 1 || ePaper==PAPER_USER)
         Swap(aSize);
 
     mpPageItem->SetLandscape(mpPaperOrientation->GetSelectedEntryPos() == 1);