fix #276868: Adding barline in mid-measure fails #4011
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See https://musescore.org/en/node/276868.
The problem, of course, is that
BarLine::layout()never gets called for the new BarLine, even during a full re-layout of the score, since it is not an EndBarLine. Thus the width of the BarLine's bbox remains at its default value of 0. For BarLines that are EndBarLines,BarLine::layout()is called fromMeasure::createEndBarLines()duringScore::collectSystem(). If the barline is dragged from the palette,BarLine::layout()is called fromScoreView::dragEnterEvent()when the BarLine is dragged into the ScoreView.