[Uml-devel] Two smaller diffs: fix crash on close and draw notes on top

[Achim Spangler]

Hi,
here are two diffs which:
a) fix a crash on closing of a document, which is triggered by
   destructor ToolBarStateArrow::~ToolBarStateArrow(){}
   --> the call of m_selectionRect.clear();
       triggered an abort
   --> I simply comment this out, as we can rely on the
       automatic destruction of direct element variables
   --> we shouldn't explicitly call clear() when this is
       not needed, and causes a segfault for some configurations

b) change notewidget to use setZ(10) so that the notes are drawn on
   top of all other widgets.
   The bodies of synchronous messages in sequence diagrams were always 
   drawn on top of my notes in my diagrams - which is really not the
   wanted behaviour

I separated the small diffs (each just one line), so that they can be applied 
separatedly.

Bye,
Achim
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