Record the object that generated the help echo and the position of that object in help_echo_object and help_echo_pos. Record that some glyphs in a row are displayed in mouse-face. (IT_update_begin): Don't clear mouse highlight unless one of the enabled glyph rows is marked as being displayed in mouse-face. (dos_rawgetc): Generate 2 events for HELP_EVENT. Pass the object and position recorded in help_echo_object and help_echo_pos to the event queue. (IT_menu_display): Accept a new argument PN: the pane number of the current menu pane. Record the pane number and the item number of the item which has associated help string. (XMenuActivate): Update the prototype for help_callback in function declaration. Call IT_menu_display with the current menu pane number as an additional argument. Call help_callback with two additional arguments: the pane number and the item number of the menu item associated with the help text. (help_echo_object, help_echo_pos): New variables. (syms_of_msdos): Initialize them and staticpro help_echo_object. (help_echo_window): New variable. (syms_of_msdos): Initialize and staticpro it. (IT_note_mode_line_highlight): Set help_echo_window. (IT_note_mouse_highlight): Ditto. (dos_rawgetc): Store help_echo_window in the second event produced for HELP_EVENTs.
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