openscad/doc/visitor-changes.txt

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Changes in visitor branch:
o import_dxf(): layername="" imports all layers. Importing a single layer with a zero-length name is no longer supported. FIXME: The same prob. goes for dims
o cylinder(): the r parameter will now always be used in place of a missing r1 or r2
o for():
- with scalar argument now works, e.g.: for (i=23) echo(i)
- empty for loop is not evaluated, e.g. for () echo(i)
- for loop with illegal value is not evaluated, e.g. for ([0:true:2])