Cannot 'Undo' text changes added from wiki editor's toolbar

Tested on Chrome 31 and Firefox 25. Works ok in Firefox, does NOT in Chrome.

Steps:

• Edit Main.Test in ?editor=wiki (0)
• Add some text (1)
• Add text effects from the toolbar (2) (like make some text bold, italics, underlined, etc.)
• Use 'Undo'
  • on FF: it will revert the text effect (2) -> (1)
  • on Chrome: the toolbar effects are not registered. The Undo will actually delete the text added. (1) -> (0)