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A general description is here.
‘install.packages()’ and ‘R CMD check’ have a small delay after removing a directory to counteract some interference from anti-virus software.
The ‘yLineBias’ of the ‘windows()’ family of devices has been changed from 0.1 to 0.2: this changes slightly the vertical positioning of text (including axis annotations). This can be overridden by setting the new ‘"ylbias"’ graphical parameter. This was done for consistency with other devices such as ‘pdf()’.
There is support for cairographics-based devices using the same code as on Unix-alikes. This can be selected by the new ‘type’ argument of the bitmap devices ‘bmp()’, ‘jpeg()’, ‘png()’ and ‘tiff()’, and devices ‘svg()’, ‘cairo_pdf()’ and ‘cairo_ps()’ are now available on Windows.
These are not compiled in by default when building from source: see the instructions in the ‘R Installation and Administration Manual’.
The fix for PR#14583 caused inconsistent behaviour in other areas, e.g. PR#14628, extra lines appearing in image displays, and uneven bases on histograms. (PR#14632).