* cmds.c (nonundocount): New global variable.
(keys_of_cmds): Initialize it. (Fself_insert_command): Use it to combine upto 20 sequential chars into a single undo entry, just like the Qself_insert_command code in keyboard.c does. Call frame_make_pointer_invisible, also like the Qself_insert_command code in keyboard.c does. * keyboard.c (command_loop_1): Use the new global nonundocount rather than its own local replacement for it.
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