Hi, I noticed that $scale and @map_scale exist in parallel, but are not consistently behaving between QGIS Desktop and QGIS server.
$scale: works fine on both Desktop and Server, but expression preview in QGIS Desktop fails. @map_scale: works fine on QGIS Desktop and also in expression preview, but fails on QGIS Server. Context: expression to calculate letter spacing in a label for different map scale. Tested on QGIS Master 2.x on Windows 7 64bit. Thank you, Andreas
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