Undo not available straight away if shift key is used to enter first character.

[Joe Kavanagh]

When entering some text into the editor use the shift key to capitalize the first character. Observe that the Undo button is not active until about 15 characters have been entered.

[Garry Yao]

Nice catch, this's something that definitely need to fix right now.

[Garry Yao]

Update key map of editing keys, modifier keys and navigation keys according to: ​keyboard keys

[Frederico Caldeira Knabben]

Please remove the space and tab keys from the editing list as having snapshots for each space reduces the undo stack too much, considering that it's a very very common key (the most common).

[Garry Yao]

Fixed with [4607].

[Damian]

This is still reproducible, although the steps to reproduce are slightly different.

1. Use Ajax sample.
   
2. Create editor and focus into body.
   
3. Press CAPS Lock once. (This means toggle once, it does not matter if it is on or off)
   
4. Type into the editor.
   

Notice that undo does not activate.

Reproduced on FF 3.5 & IE 7

[Garry Yao]

Fixed with [4817].