(IT_clear_end_of_line): Print the extent of the cleared
part of the line to the termscript file. (IT_clear_to_end): Clear the entire line, not just its beginning. (menu_help_message, prev_menu_help_message): New variables. (IT_menu_make_room): Make room for the help_text member. (IT_menu_display): New argument disp_help; all callers changed. If disp_help is non-zero, store the help text of the active menu item in menu_help_message. (XMenuAddPane): Initialize the help_text member to NULL. (XMenuAddSelection): New argument help_text. Store it in the XMenu structure. (XMenuActivate): New argument help_callback. If the value of menu_help_message has changed since the last time, display the menu help message text while waiting for the mouse to move. Clear the echo area before exiting. (XMenuDestroy): Free the help_text member.
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