Implement actual swapping on drag and drop

js/components/EditableStringList.js

@@ -128,7 +128,18 @@ export default class EditableStringList extends React.Component {
     }
 
     onGroupSwitch(src, dest) {
-        console.log('Switched src (' + JSON.stringify(src) + ') to dest (' + JSON.stringify(dest) + ')' );
+        const groupCopy = this.state.groups.slice();
+
+        const srcTeam = groupCopy[src.group][src.team];
+        const destTeam = groupCopy[dest.group][dest.team];
+
+        groupCopy[src.group].splice(src.team, 1, destTeam);
+        groupCopy[dest.group].splice(dest.team, 1, srcTeam);
+
+        this.setState({
+            groups: groupCopy
+        });
+        this.props.onGroupsChange(this.state.groups);
     }
 
     render() {