Fixed bug #33826. Improved document correction after performing of an undo.

word/Editor/CollaborativeEditing.js

@@ -759,10 +759,11 @@ CWordCollaborativeEditing.prototype.Undo = function()
 	for (var sId in mapDocumentContents)
 	{
 		var oDocumentContent = mapDocumentContents[sId];
-		if (oDocumentContent.Content.length <= 0)
+		var nContentLen = oDocumentContent.Content.length;
+		if (nContentLen <= 0 || type_Paragraph !== oDocumentContent.Content[nContentLen - 1].GetType())
 		{
 			var oNewParagraph = new AscCommonWord.Paragraph(oLogicDocument.Get_DrawingDocument(), oDocumentContent, 0, 0, 0, 0, 0, false);
-			oDocumentContent.Add_ToContent(0, oNewParagraph);
+			oDocumentContent.Add_ToContent(nContentLen, oNewParagraph);
 		}
 	}
 	for (var sId in mapParagraphs)

word/Editor/Run.js

@@ -5755,6 +5755,10 @@ ParaRun.prototype.Set_ContentPosition = function(DocPos, Depth, Flag)
         case  0: Pos = DocPos[Depth].Position; break;
     }
 
+    var nLen = this.Content.length;
+    if (nLen > 0 && Pos >= nLen && para_End === this.Content[nLen - 1].Type)
+    	Pos = nLen - 1;
+
     this.State.ContentPos = Pos;
 };
 ParaRun.prototype.Set_SelectionAtEndPos = function()