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A general description is here.
Graphics devices should now specify ‘deviceVersion’ to indicate what version of the graphics engine they support.
The graphics engine version, ‘R_GE_version’, has been bumped to 14 and so packages that provide graphics devices should be reinstalled.
Graphics devices can now specify ‘deviceClip’. If ‘TRUE’, the graphics engine will never perform any clipping of output itself.
The clipping that the graphics engine does perform (for both ‘canClip = TRUE’ and ‘canClip = FALSE’) has been improved to avoid producing unnecessary artifacts in clipped output.