QGIS » QGIS Application

For me it's not possible anymore to configure labeling (for QgsVectorLayer) using setCustomProperty().

I found out that setCustomProperty() is working fine in the python console.
So my problem is not setCustomProperty() itself, but something with the QVariant and/or QLatin1String type.

Labeling seems to be correctly configured when I check it in the python console:

layer = iface.activeLayer()
layer.customProperty("labeling")

'pal'

layer.customProperty("labeling/enabled")

'true'

But when I look at the types the result is this:

layer.customProperty("labeling").__class__

<class 'future.types.newstr.newstr'>

layer.customProperty("labeling/enabled").__class__

<class 'future.types.newstr.newstr'>

This code does NOT make labeling work:

layer.setCustomProperty("labeling", layer.customProperty("labeling"))
layer.setCustomProperty("labeling/enabled", layer.customProperty("labeling/enabled"))

But this code does:

layer.setCustomProperty("labeling", 'pal')
layer.setCustomProperty("labeling/enabled", 'true')

And this code also - at least in the python console:

layer.setCustomProperty("labeling",str(layer.customProperty("labeling")))
layer.setCustomProperty("labeling/enabled",str(layer.customProperty("labeling/enabled")))

I am not able to workaround this issue, because in my plugin the str() function always return a "newstr".
Do you have any hints how I could workaround this issue?

Maybe this line of code is the cause of this problem (QgsVectorLayer.cs, line 4546 in master):

if ( customProperty( QStringLiteral( "labeling" ) ).toString()==QLatin1String( "pal" ) )