Remember element that was in focus before rendering dialog

restore focus to that element when we unmount

also remove some whitespace because ESLint is a big bad bully...

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/dialogs/BaseDialog.js

@@ -47,6 +47,16 @@ export default React.createClass({
         children: React.PropTypes.node,
     },
 
+    componentWillMount: function() {
+        this.priorActiveElement = document.activeElement;
+    },
+
+    componentWillUnmount: function() {
+        if (this.priorActiveElement !== null) {
+            this.priorActiveElement.focus();
+        }
+    },
+
     _onKeyDown: function(e) {
         if (e.keyCode === KeyCode.ESCAPE) {
             e.stopPropagation();
@@ -67,7 +77,7 @@ export default React.createClass({
 
     render: function() {
         const TintableSvg = sdk.getComponent("elements.TintableSvg");
-                
+
         return (
             <div onKeyDown={this._onKeyDown} className={this.props.className}>
                 <AccessibleButton onClick={this._onCancelClick}