Handle cases where elided text becomes empty or "..."

Render the whole text if the elided text becomes empty or if it only
contains one character, i.e. if it becomes "…". Solved as implemented
because I was not able to check for "…" explicitly, i.e. the comparison
against "…" still failed.

src/core/Track.cpp

@@ -656,6 +656,11 @@ void TrackContentObjectView::paintTextLabel(QString const & text, QPainter & pai
 	QFontMetrics fontMetrics(labelFont);
 	QString elidedPatternName = fontMetrics.elidedText(text, Qt::ElideMiddle, width() - 2 * textLeft);
 
+	if (elidedPatternName.length() < 2)
+	{
+		elidedPatternName = text.trimmed();
+	}
+
 	painter.fillRect(QRect(0, 0, width(), fontMetrics.height() + 2 * textTop), textBackgroundColor());
 
 	painter.setPen( textColor() );