Fix disappearing tooltips on SVG reload

Use a unified linebreak in the chart controller, so the tooltip handling will recognize the titles as identical

library/Icinga/Chart/Graph/Tooltip.php

@@ -67,7 +67,7 @@ class Tooltip
      */
     public function __construct (
         $data = array(),
-        $format = '<b>{title}</b></b><br> {value} of {sum} {label}'
+        $format = '<b>{title}</b></b><br/> {value} of {sum} {label}'
     ) {
         $this->data = array_merge($this->data, $data);
         $this->defaultFormat = $format;

modules/monitoring/application/controllers/ChartController.php

@@ -154,7 +154,7 @@ class Monitoring_ChartController extends Controller
             ->setXAxis(new \Icinga\Chart\Unit\StaticAxis())
             ->setAxisMin(null, 0);
 
-        $tooltip = t('<b>{title}:</b><br />{value} of {sum} services are {label}');
+        $tooltip = t('<b>{title}:</b><br>{value} of {sum} services are {label}');
         $this->view->chart->drawBars(
             array(
                 'label' => t('Ok'),
@@ -206,7 +206,7 @@ class Monitoring_ChartController extends Controller
                 $hostgroup->hosts_unreachable_unhandled
             );
         }
-        $tooltip = t('<b>{title}:</b><br /> {value} of {sum} hosts are {label}');
+        $tooltip = t('<b>{title}:</b><br> {value} of {sum} hosts are {label}');
         $this->view->chart = new GridChart();
         $this->view->chart->alignTopLeft();
         $this->view->chart->setAxisLabel('', t('Hosts'))