Unnecessary snapshots

[Artur Formella]

Now we're saving snapshot for many commands which doesn't make sense for supporting undo, these are:

1. Preview
   
2. Copy
   
3. Spell Check
   
4. Find/Replace ( Each replacing is needing one, but not the dialog command )
   
5. Select All
   
6. Maximize
   
7. Show Block
   
8. About
   

We should give them a canUndo = false.

[Frederico Caldeira Knabben]

I'm just not sure about Spell Check. We must be sure we can undo a spell checking change after closing the dialog.

[Artur Formella]

9. We can't undo Print command

[Garry Yao]

Why not declare:

CKEDITOR.plugins.print =
{
        ...
        modes : { wysiwyg : !( CKEDITOR.env.opera ) }           // It is imposible to print the inner document in Opera.
        canUndo : false
};

Instead of doing:

  var command = editor.addCommand( pluginName, CKEDITOR.plugins.print ); 
  command.canUndo = false;

[Artur Formella]

You are right.

[Artur Formella]

Fixed with [3608]