public/ckeditor/4.4dev/plugins/undo/plugin.js
function( newImage ) {
			// Do not change snapshots stack is locked.
			if ( this.locked )
				return;

			if ( !newImage )
				newImage = new Image( this.editor );

			var i = this.index,
				snapshots = this.snapshots;

			// Find all previous snapshots made for the same content (which differ
			// only by selection) and replace all of them with the current image.
			while ( i > 0 && this.currentImage.equalsContent( snapshots[ i - 1 ] ) )
				i -= 1;

			snapshots.splice( i, this.index - i + 1, newImage );
			this.index = i;
			this.currentImage = newImage;
		}
function( newImage ) {
			// Do not change snapshots stack is locked.
			if ( this.locked )
				return;

			if ( !newImage )
				newImage = new Image( this.editor );

			var i = this.index,
				snapshots = this.snapshots;

			// Find all previous snapshots made for the same content (which differ
			// only by selection) and replace all of them with the current image.
			while ( i > 0 && this.currentImage.equalsContent( snapshots[ i - 1 ] ) )
				i -= 1;

			snapshots.splice( i, this.index - i + 1, newImage );
			this.index = i;
			this.currentImage = newImage;
		}
function ( newImage ) { // Do not change snapshots stack is locked.
 if ( this . locked ) return ; if ( ! newImage ) newImage = new Image ( this . editor ) ; var i = this . index , snapshots = this . snapshots ; // Find all previous snapshots made for the same content (which differ
 // only by selection) and replace all of them with the current image.
 while ( i > 0 && this . currentImage . equalsContent ( snapshots [ i - 1 ] ) ) i -= 1 ; snapshots . splice ( i , this . index - i + 1 , newImage ) ; this . index = i ; this . currentImage = newImage ; }
Updates the last snapshot of the undo stack with the current editor content.

@param {CKEDITOR.plugins.undo.Image} [newImage] The image which will replace the current one.
If it is not set, it defaults to the image taken from the editor.
Updates the last snapshot of the undo stack with the current editor content .