* keyboard.c (echo_char, read_char): Apply EVENT_HEAD without first
testing for EVENT_HAS_PARAMETERS; EVENT_HEAD works properly on all sorts of events now. (read_key_sequence): Use the new accessors to decide in which window an event occurred. * keyboard.c (Qevent_unmodified): Replaced by... (Qevent_symbol_elements): New property. (syms_of_keyboard): initialize and staticpro the latter, not the former. * keyboard.c (readable_events): This doesn't need to scan and discard mouse release events anymore; it just uses EVENT_QUEUES_EMPTY. (kbd_buffer_get_event): No need to skip past mouse release events. * keyboard.c (button_down_location): New variable, which stores the location at which each button was pressed, so we can build a complete drag event when the button is released. (make_lispy_event): When a button is pressed, record its location in button_down_location, and turn it into a `down' event. When a button is released, compare its release location with its press location, and decide whether to call it a `click' or `drag' event. Change mouse movement events to be arranged like click events. (format_modifiers): Note that the click modifier has no written representation. (modifier_names, modifer_symbols): New variables, used to create the Qevent_symbol_elements property. (modify_event_symbol): Change the format of the modified symbol cache; there are too many modifier bits now to use a vector indexed by a modifier mask. Use an assoc-list instead. Document the format of the cache. Put the Qevent_symbol_elements property on each new symbol, instead of a Qevent_unmodified property. (symbols_of_keyboard): Put Qevent_symbol_elements properties on the symbols specified in head_table, not Qevent_unmodifed properties. Initialize and staticpro modifier_symbols, and staticpro the window elements of button_down_location.
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