Deal with subpixel precision when calculating targetWidth

Issue #68

Author: pablosichert

src/Truncate.js

@@ -132,7 +132,10 @@ export default class Truncate extends Component {
             return;
         }
 
-        const targetWidth = target.parentNode.getBoundingClientRect().width;
+        // Floor the result to deal with browser subpixel precision
+        const targetWidth = Math.floor(
+            target.parentNode.getBoundingClientRect().width
+        );
 
         // Delay calculation until parent node is inserted to the document
         // Mounting order in React is ChildComponent, ParentComponent