[QGIS-Developer] can't load plugins with QGIS custom widgets in windows

[Enrico Ferreguti]

I'm getting the following exception:

AttributeError: unknown enum QgsMapLayerProxyModel::RasterLayer
>

loading a plugin with QGIS custom QT designer widget in windows standalone
QGIS 2.14 ltr and 2.18.

The exception doesn't affect linux and osgeo4win installations.

I found that this was a 2015 reported issue:
https://issues.qgis.org/issues/13428
and I solve it as suggested in
https://lists.osgeo.org/pipermail/qgis-developer/2015-September/039196.html
simply copying a file in the right place.

The fix is apparently easy and considering that Qt custom widgets are
widely used I can't figure why this old issue isn't yet solved.

Is it a qgis or an osgeo4win issue? Should I reopen a ticket?

Thanks. Enrico Ferreguti.
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