Adding support for preventing expending graphical element to have a negative position
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<font size="3">The PLCopen Editor saves and loads XML projects,<BR>accordingly to PLCopen TC6-XML Schemes.</font>
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More informations on :
<a href="http://www.beremiz.org/">http://www.beremiz.org/</a>
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Supported by LOLITech :
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<a href="http://www.lolitech.fr">http://www.lolitech.fr</a>
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