Clean up read_key_sequence a bit; reread active keymaps after first event.
* src/keyboard.c (read_char, read_char_x_menu_prompt) (read_char_minibuf_menu_prompt): Replace nmaps+maps with a single `map' arg. (follow_key): Operate on a single map. (active_maps): New function. (test_undefined): Also return true for nil bindings. (read_key_sequence): Use active_maps to replace the arrays of keymaps with a single (composed) keymap. Remember `first_event' to choose the right set of active keymaps. Recompute the set of keymaps after receiving the first event. Remove GOBBLE_FIRST_EVENT. (syms_of_keyboard): Remove inhibit_local_menu_bar_menus. * src/keyboard.h (read_char): Update declaration. * src/lread.c (read_filtered_event): Adjust call to read_char. * lisp/cus-start.el (all): Remove inhibit-local-menu-bar-menus.
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