(Vdos_unsupported_char_glyph): New variable.
(syms_of_msdos): DEFVAR_LISP it. (IT_insert_glyphs, IT_delete_glyphs): New functions which abort Emacs. (internal_terminal_init): Set up insert_glyphs_hook and delete_glyphs_hook to call them. Explicitly set char_ins_del_ok to 0. (unibyte_display_via_language_environment): New variable. (syms_of_msdos): Devfar it. (IT_write_glyphs): Honor glyph aliasing via Vglyph_table. Encode the character codes of the glyphs according to the terminal_coding in effect.
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