Treat batch stdout/stderr like standard display
Calls like (print FOO) could generate improperly encoded or hard-to-read output if FOO contains characters outside the system locale. Fix this by treating batch stdout and stderr like interactive standard display, when it comes to transliterating and encoding characters (Bug#20545). * doc/emacs/mule.texi (Communication Coding): * doc/lispref/display.texi (Active Display Table): * doc/lispref/nonascii.texi (Locales): * etc/NEWS: * src/coding.c (syms_of_coding): * src/dispnew.c (syms_of_display): Document this. * src/print.c: Include disptab.h. (printchar_to_stream): New function, with much of the guts of the old Fexternal_debugging_output, except this one also uses the standard display table. (printchar, strout, Fexternal_debugging_output): Use it.
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