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A general description is here.
The drop-field control in GraphApp can now be left with the TAB key, improving accessibility of the ‘Rgui’ configuration editor.
The default C++ standard has been changed to C++17 where available (which it is on all currently checked platforms): if not C++14 or C++11 is used if available otherwise C++ is not supported.
‘configure’ is now passed crucial variables such as ‘CC’ and ‘CFLAGS’ in its environment, as many packages were not setting them (as documented in ‘Writing R Extensions’ §1.2).
This has most effect where ‘configure’ is used to compile parts of the package - most often by ‘cmake’ or ‘libtool’ which obfuscate the actual compile commands used.
Also used for ‘configure.win’ and ‘configure.ucrt’ on Windows.
Running examples from HTML documentation now restores previous ‘knitr’ settings and options (PR#18420).