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ghid_port_window_motion_cb() which should do the work, but going
after all the functions inside its body ( ghid_note_event_location(),
ghid_show_crosshair(), ghid_draw_area_update() ) I can't see who
really does the move and where is the list of items to move.
My purpose is to avoid moving entire lines when dragging a line intersection,
instead just moving the intersection.
I guess the key point is to avoid selection of entire lines when first pressing
the left button; in the code I come to NotifyMode() with "case ARROW_MODE":
an iteration checks a type returned by SearchScreen() and exits if something
is already selected; but how does it store the list of items to be moved?
Any help?

-Alberto