Display bigger legend labels correctly without overlapping

library/Icinga/Chart/Legend.php

@@ -66,13 +66,14 @@ class Legend implements Drawable
         $outer->getLayout()->setPadding(2, 2, 2, 2);
         $nrOfColumns = 4;
 
-        $leftstep = 100 / $nrOfColumns;
         $topstep = 10 / $nrOfColumns + 2;
 
         $top = 0;
         $left = 0;
         $lastLabelEndPos = -1;
         foreach ($this->dataset as $color => $text) {
+            $leftstep = 100 / $nrOfColumns + strlen($text);
+
             // Make sure labels don't overlap each other
             while ($lastLabelEndPos >= $left) {
                 $left += $leftstep;