#6033: This is a proposed fix for the issue where the "selectAll" hea…

…der check is not in sync with the actual selection state of the row. Perhaps this is not the best solution because it couples the selection directive the ui-grid directive. However, this does illustrate a possible solution.

src/js/core/factories/Grid.js

@@ -1136,6 +1136,7 @@ angular.module('ui.grid')
     var self = this;
     var oldRows = self.rows.slice(0);
     var oldRowHash = self.rowHashMap || self.createRowHashMap();
+    var allRowsSelected = true;
     self.rowHashMap = self.createRowHashMap();
     self.rows.length = 0;
 
@@ -1163,8 +1164,15 @@ angular.module('ui.grid')
 
       self.rows.push( newRow );
       self.rowHashMap.put( newEntity, newRow );
+      if (!newRow.isSelected) {
+        allRowsSelected = false;
+      }
     });
 
+    if (self.selection) {
+      self.selection.selectAll = allRowsSelected;
+    }
+
     self.assignTypes();
 
     var p1 = $q.when(self.processRowsProcessors(self.rows))