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A general description is here.
Configuration and ‘R CMD javareconf’ now come up with a smaller set of library paths for Java on Oracle-format JDK (including OpenJDK). This helps avoid conflicts between libraries (such as ‘libjpeg’) supplied in the JDK and system libraries. This can always be overridden if needed: see the ‘R Installation and Administration’ manual.
‘qgeom()’ could return ‘-1’ for extremely small ‘q’. (PR#14967)
‘smooth.spline()’ used ‘DUP = FALSE’ which allowed its compiled C code to change the function: this was masked by the default byte-compilation. (PR#14965)
On OS X, the Quartz versions of the bitmap devices did not respect ‘antialias = "none"’. (PR#15006)
The detection of the C stack direction is better protected against compiler optimization. (PR#15011)
Long custom line types would sometimes segfault on the cairographics-based devices. (PR#15055)
Closed the ‘<li>’ tag in pages generated by ‘ Rd2HTML()’. (PR#14841)
Axis tick marks could go out of range when a log scale was used. (PR#14833)