adding test to reproduce onPaste-coammnd-multiselect error

lib/ace/multi_select_test.js

@@ -153,6 +153,24 @@ module.exports = {
         var range4 = new Range(0, 0, 4, 0);
         selection.addRange(range4);
         assert.ok(!editor.inMultiSelectMode);
+    },
+
+    "test: onPaste in command with multiselect": function() {
+        var doc = new EditSession(["l1", "l2"]);
+        editor = new Editor(new MockRenderer(), doc);
+        MultiSelect(editor);
+        editor.commands.addCommand({
+            name: 'insertfoo',
+            exec: function(ed) { ed.onPaste('foo'); },
+            multiSelectAction: "forEach"
+        });
+        var selection = editor.selection,
+            range1 = new Range(0,2,0,2),
+            range2 = new Range(1,2,1,2);
+        selection.fromOrientedRange(range1)
+        selection.addRange(range2);
+        editor.execCommand('insertfoo');
+        assert.equal('l1foo\nl2foo', editor.getValue());
     }
 };