#12764: Apply patch for locking issues

git-svn-id: file:///svn/Scribus/trunk/Scribus@19566 11d20701-8431-0410-a711-e3c959e3b870
#12756: Undo does not close "Nodes" dialog

git-svn-id: file:///svn/Scribus/trunk/Scribus@19567 11d20701-8431-0410-a711-e3c959e3b870