Add detailed documentation on Visio 2013 Del='1' connection point attribute from section N='Connection'
We are VSTO add-ins developers (Visio 2007, Visio 2010, Visio 2013) and have hit a major software issue when we convert a .vdx file to the new .vsdx file format. When opening the converted Visio drawing, with Visio 2013, it keeps adding the Del='1' attribute on some connection points in the Visio drawing which disconnects the shapes.
This problem is intermittent and has pop-up on more than 1 computer although on some other computers this works fine.
I have already posted my issue in MSDN forums; here's the link for reference: https://social.technet.microsoft.com/Forums/en-US/6a43db8a-8339-4568-98b9-4ed999314368/visio-2013-keeps-disconnecting-shapes-by-adding-the-section-nconnection-with-rows-containing-the?forum=vsto
We would love to find some documentation explaining all of the different attributes; the reason why Visio 2013 decides to add them when there have been no change made by the user.