[fixed] Use latest props in column metrics generator

Author: alistairjcbrown

src/ColumnMetricsMixin.js

@@ -45,7 +45,7 @@ module.exports = {
   componentWillReceiveProps(nextProps: ColumnMetricsType) {
     if (nextProps.columns) {
       if (!ColumnMetrics.sameColumns(this.props.columns, nextProps.columns, this.props.columnEquality)) {
-        var columnMetrics = this.createColumnMetrics();
+        var columnMetrics = this.createColumnMetrics(nextProps);
         this.setState({columnMetrics: columnMetrics});
       }
     }
@@ -95,9 +95,9 @@ module.exports = {
     this.setState({columnMetrics});
   },
 
-  createColumnMetrics(initialRun){
-    var gridColumns = this.setupGridColumns();
-    return this.getColumnMetricsType({columns:gridColumns, minColumnWidth: this.props.minColumnWidth}, initialRun);
+  createColumnMetrics(props = this.props){
+    var gridColumns = this.setupGridColumns(props);
+    return this.getColumnMetricsType({columns:gridColumns, minColumnWidth: this.props.minColumnWidth});
   },
 
   onColumnResize(index: number, width: number) {

src/addons/grids/ReactDataGrid.js

@@ -93,7 +93,7 @@ var ReactDataGrid = React.createClass({
   },
 
   getInitialState: function(): {selected: SelectedType; copied: ?{idx: number; rowIdx: number}; selectedRows: Array<Row>; expandedRows: Array<Row>; canFilter: boolean; columnFilters: any; sortDirection: ?SortType; sortColumn: ?ExcelColumn; dragged: ?DraggedType;  } {
-    var columnMetrics = this.createColumnMetrics(true);
+    var columnMetrics = this.createColumnMetrics();
     var initialState = {columnMetrics, selectedRows : this.getInitialSelectedRows(), copied : null, expandedRows : [], canFilter : false, columnFilters : {}, sortDirection: null, sortColumn: null, dragged : null, scrollOffset: 0}
     if(this.props.enableCellSelect){
       initialState.selected = {rowIdx: 0, idx: 0};
@@ -344,9 +344,9 @@ var ReactDataGrid = React.createClass({
 
   },
 
-  setupGridColumns : function(): Array<any>{
-    var cols = this.props.columns.slice(0);
-    if(this.props.enableRowSelect){
+  setupGridColumns : function(props = this.props): Array<any>{
+    var cols = props.columns.slice(0);
+    if(props.enableRowSelect){
       var selectColumn = {
           key: 'select-row',
           name: '',