* xterm.c (x_find_modifier_meanings): If there are no
modifiers containing a Meta_ keysym, use the Alt keysyms to denote meta. (construct_mouse_click): Set the down_modifier bit on mouse button press events. (XTread_socket): When processing keypress events, use x_meta_mod_mask when processing ordinary ASCII characters, not just when processing function keys and other non-ASCII events. (XTread_socket): If we receive a MappingNotify event with the `request' member set to `MappingModifier', then call x_find_modifier_meanings to refresh x_meta_mod_mask.
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