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In QGIS 2 I could specify data defined rounded corners for labels background, using a string, for example '5, 5' :
In QGIS 3, this same syntax is correctly recognised by the expression generator, but labels corners remain square :
Does anyone know the right syntax or is this a bug ?
It's a bug - see https://github.com/qgis/QGIS/pull/6493. A fix will be in 3.0.1.
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