tdf#98094 make header able to drag in Navigator root content view after

...first drag is done from all categories content view

Change-Id: If76b8fa02a60009e2b60b2b57bae6e0519bf8e2d
Reviewed-on: https://gerrit.libreoffice.org/53832Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Heiko Tietze <tietze.heiko@gmail.com>

sw/source/uibase/utlui/content.cxx

@@ -1972,6 +1972,9 @@ void SwContentTree::ToggleToRoot()
             if (m_nRootType == ContentTypeId::OUTLINE)
             {
                 SetSelectionMode(SelectionMode::Multiple);
+                SetDragDropMode(DragDropMode::CTRL_MOVE |
+                    DragDropMode::CTRL_COPY |
+                    DragDropMode::ENABLE_TOP);
             }
         }
     }