The maximum edge length for the Mefisto mesher is always set in the accept() method so that effectively user input is always ignored.
There is now a button Estimate to guess a good default value. And user input is no longer ingored
for Drawing, Image, Inspection, Mesh, MeshPart, Part, Path, Points, Raytracing, ReverseEngineering, Spreadsheet, Start, Surface, Web
TODO: fix several -Woverflow in area