[QGIS-Developer] $scale vs @map_scale - QGIS v2 vs v3

[Andreas Neumann]

Hi, 

When migrating our version 2 to version 3 projects, most of our
symbology needs revision, because our data-defined properties used a lot
the "$scale" variable. 

What is the exact reason that $scale fails in version 3 and had been
replaced by @map_scale? 

Is there really no upgrade path for this? We have many, many projects,
and almost all of them need to be upgraded in version 3 to use
"@map_scale" instead of "$scale". 

Thanks for your reply, 

Andreas
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