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A general description is here.
The ‘windows()’ family of devices now supports() per-pixel alpha for raster images.
Shutting down the R session cleaned up the temporary directory before closing all graphics devices. On Windows this necessitated changing the working directory, so some devices (e.g. ‘tiff()’) could write files in the wrong directory. The order has been reversed.
‘file.info()’ now accepts ‘file’ names with trailing directory separators, even though such names are invalid on Windows.