trangchongcheng

Currently, i cant multiple undo.When hit ctr+z then only undo to empty.

You should set css property `word-break: break-all `for editor because some case length word make break layout. Example text: **texttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttext**