(XTupdate_begin): Discard records of prior mouse highlight
when frame must be redrawn. (x_make_frame_visible, x_make_frame_invisible) (x_iconify_frame): Give error if frame has explicit_parent. (x_new_font): Don't set window height if frame has explicit_parent. (x_mouse_leave): New function broken out of XTread_socket. When x_focus_event_frame is nonzero, assume that frame gets focus. (XTread_socket): Use x_mouse_leave for LeaveNotify.
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