add eslint no-nested-ternary rule and fix violations

src/components/scrollManager.js

@@ -61,7 +61,12 @@ import layoutManager from './layoutManager';
      * @return {number} Clamped value.
      */
     function clamp(value, min, max) {
-        return value <= min ? min : value >= max ? max : value;
+        if (value <= min) {
+            return min;
+        } else if (value >= max) {
+            return max;
+        }
+        return value;
     }
 
     /**