Add a margin of 4 pixels around every plot to avoid text going all the way to the edge

ApplicationCode/UserInterface/RiuQwtPlotTools.cpp

@@ -87,6 +87,8 @@ void RiuQwtPlotTools::setCommonPlotBehaviour(QwtPlot* plot)
     plot->canvas()->setMouseTracking(true);
     plot->canvas()->installEventFilter(plot);
     plot->plotLayout()->setAlignCanvasToScales(true);
+
+    plot->setContentsMargins(4, 4, 4, 4);
 }
 
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