(mac_compute_glyph_string_overhangs): Don't set
overhangs unless the given glyph type is noncomposite CHAR_GLYPH. [USE_CARBON_EVENTS] (mac_convert_event_ref): Convert dead key down events. (XTread_socket): Don't pass keyboard events with the option modifier to the system when Vmac_command_key_is_meta is nil or Vmac_option_modifier is non-nil. [USE_CARBON_EVENTS] (read_socket_inev): New variable. [USE_CARBON_EVENTS] (init_command_handler): Fix argument. [USE_CARBON_EVENTS] (mac_handle_mouse_event): New Carbon event handler function. (install_window_handler) [USE_CARBON_EVENTS]: Install it. (XTread_socket) [USE_CARBON_EVENTS]: Move mouse wheel event handler part to mac_handle_mouse_event.
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