User Chart UI tweaks

.. scaling maximum increased to x10 which helps on hi-dpi
   displays and the overview

.. slightly reduce the border on overview to make more of
   the available screen real estate.

src/Charts/UserChart.cpp

@@ -777,9 +777,9 @@ UserChartSettings::UserChartSettings(Context *context, bool rangemode, GenericCh
     scale = new QSlider(Qt::Horizontal, this);
     scale->setTickInterval(1);
     scale->setMinimum(1);
-    scale->setMaximum(9);
+    scale->setMaximum(18);
     scale->setSingleStep(1);
-    scale->setValue(1 + ((chart.scale-1)*2)); // 1-5 mapped to 1-7, where scale is 1,1.5,2,2.5,3,3.5,4,4.5,5
+    scale->setValue(1 + ((chart.scale-1)*2)); // scale is in increments of 0.5
     cf->addRow(tr("Scale"), scale);
 
 

src/Charts/UserChartOverviewItem.cpp

@@ -98,7 +98,7 @@ void
 UserChartOverviewItem::itemGeometryChanged() {
 
     QRectF geom = geometry();
-    proxy->setGeometry(QRectF(geom.x()+40,geom.y()+(ROWHEIGHT*2),geom.width()-80, geom.height()-((ROWHEIGHT*2)+40)));
+    proxy->setGeometry(QRectF(geom.x()+20,geom.y()+(ROWHEIGHT*2),geom.width()-40, geom.height()-((ROWHEIGHT*2)+20)));
 
     if (drag) chart->hide();
     else /*if (parent->state != ChartSpace::DRAG)*/ chart->show();