Stateful toolbar buttons not staying selected in IE 6 and 7

[jskripsky]

While selecting text and toggling bold on/off works, it's not possible to switch to bold mode for text yet to be entered. This works in FF, but not in IE 6/7. This seems to be a recent regression as build 16848 (demo of www.fckediter.net) doesn't have the problem.

How to reproduce

1. download latest nightly build
2. open some sample file (e.g. sample01.html) with IE 6 or 7
3. type some text
4. click Bold button

Result:

• button doesn't stay selected
• typing results in regular (i.e. non-bold) text being added

[fredck]

Confirmed with IE7. This bug has been introduced with [1084].

[fredck]

I've partially reverted [1084] with [1134] and changed its logic to satisfy #1491. It seems it has fixed it, but I'll leave this ticket open for a final check from Martin.