copy insert start position before storing it in undoStack

lib/ace/document.js

@@ -401,20 +401,20 @@ var Document = function(textOrLines) {
     *
     **/    
     this.insertMergedLines = function(position, lines) {
-        this.$clipPosition(position);
-        var endPoint = {
-            row : position.row + lines.length - 1,
-            column : (lines.length == 1 ? position.column : 0) + lines[lines.length - 1].length
+        var start = this.clippedPos(position.row, position.column);
+        var end = {
+            row: start.row + lines.length - 1,
+            column: (lines.length == 1 ? start.column : 0) + lines[lines.length - 1].length
         };
         
         this.applyDelta({
-            start: position,
-            end: endPoint,
+            start: start,
+            end: end,
             action: "insert",
             lines: lines
         });
         
-        return endPoint;
+        return this.clonePos(end);
     };
 
     /**

lib/ace/multi_select_test.js

@@ -30,6 +30,7 @@
 
 if (typeof process !== "undefined") {
     require("amd-loader");
+    require("./test/mockdom");
 }
 
 define(function(require, exports, module) {
@@ -41,6 +42,7 @@ var MockRenderer = require("./test/mockrenderer").MockRenderer;
 var Range = require("./range").Range;
 var assert = require("./test/assertions");
 var MultiSelect = require("./multi_select").MultiSelect;
+var UndoManager = require("./undomanager").UndoManager;
 
 var editor;
 var exec = function(name, times, args) {
@@ -195,6 +197,20 @@ module.exports = {
         selection.fromJSON(after);
         assert.ok(!selection.isEqual(before));
         assert.ok(selection.isEqual(after));
+    },
+    
+    "test multiselect align": function() {
+        var doc = new EditSession(["l1", "l2", "l3"]);
+        doc.setUndoManager(new UndoManager());
+        editor = new Editor(new MockRenderer(), doc);
+        var selection = editor.selection;
+        selection.addRange(new Range(1,0,1,0))
+        selection.addRange(new Range(2,2,2,2))
+        editor.execCommand("alignCursors");
+        assert.equal('  l1\n  l2\nl3', editor.getValue());
+        doc.markUndoGroup();
+        editor.execCommand("undo");
+        assert.equal('l1\nl2\nl3', editor.getValue());
     }
 };