get_rendering_string: don't use 'source.Proxy.type' attr to choose RenderHandler #193
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ref: https://forum.freecadweb.org/viewtopic.php?style=4&f=10&t=69321
Scripted objects can create/set arbitrary attributes in their Proxy
objects. Formerly, if an object's Proxy had a 'type' attribute, it would
be used to determine which Rendering Handler should be used. This behavior
caused errors e.g. for FastenersWB objects, which used the type param
to indicate the specification of a fastener.
This commit changes the behavior of the get_rendering_string function
to check if an object needs a specific handler using the Proxy's python type.
The example file in the linked forum post now works properly with this fix.