fix glisses as well

Backport of musescore#8953, part 3

Author: asattely

libmscore/line.cpp

@@ -1184,14 +1184,14 @@ void SLine::layout()
                   // start segment
                   lineSegm->setSpannerSegmentType(SpannerSegmentType::BEGIN);
                   lineSegm->setPos(p1);
-                  qreal x2 = system->bbox().right();
+                  qreal x2 = system->lastNoteRestSegmentX(true);
                   lineSegm->setPos2(QPointF(x2 - p1.x(), 0.0));
                   }
             else if (i > 0 && i != sysIdx2) {
                   // middle segment
                   lineSegm->setSpannerSegmentType(SpannerSegmentType::MIDDLE);
                   qreal x1 = system->firstNoteRestSegmentX(true);
-                  qreal x2 = system->bbox().right();
+                  qreal x2 = system->lastNoteRestSegmentX(true);
                   lineSegm->setPos(QPointF(x1, p1.y()));
                   lineSegm->setPos2(QPointF(x2 - x1, 0.0));
                   }