Improvements for curved quotes on Linux consule
This should help Emacs work better out-of-the-box on Linux consoles, which have only limited support for displaying Unicode characters. Also, undo the recent change that caused text-quoting-style to affect quote display on terminals, so that the two features are independent. See Alan Mackenzie in: http://lists.gnu.org/archive/html/emacs-devel/2015-09/msg00244.html Finally, add a style parameter to startup--setup-quote-display, so that this function can also be invoked after startup, with different styles depending on user preference at the time. * configure.ac: Check for linux/kd.h header. * doc/emacs/display.texi (Text Display): Document quote display. * doc/lispref/display.texi (Active Display Table): * etc/NEWS: * lisp/startup.el (startup--setup-quote-display, command-line): text-quoting-style no longer affects quote display. * doc/lispref/frames.texi (Terminal Parameters): Fix typo. * lisp/international/mule-util.el (char-displayable-p): * lisp/startup.el (startup--setup-quote-display): On a text terminal supporting glyph codes, use the reported glyph codes instead of the terminal coding system, as this is more accurate on the Linux console. * lisp/startup.el (startup--setup-quote-display): New optional arg STYLE. * src/fontset.c (Finternal_char_font): Report glyph codes for a text terminal, if they are available. Currently this is supported only for the Linux console. * src/termhooks.h (struct terminal): New member glyph-code-table. * src/terminal.c [HAVE_LINUX_KD_H]: Include <errno.h>, <linux/kd.h>. (calculate_glyph_code_table) [HAVE_LINUX_KD_H]: New function. (terminal_glyph_code): New function.
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