Bug: Histogram Does Not Update when Using Painting Tools

I was investigating something else, and I saw something not working... I'm under the distinct impression that the Histogram panel should automatically update after every operation. Having the Histogram panel displayed full-time on the screen, it should always be up to date.
However, when I Dodge or Burn or even paint color on an image, the Histogram is not updating.
If I select one of the History states I've just created, it updates.
Consider this simple sequence of operations:
I'm able to reproduce this failure in Photoshop CS5 as well, BUT NOT IN CS4 (it updates in Photoshop CS4 after every painting operation), so clearly it's not a new bug, though somehow I've managed not to notice it in my years of using Photoshop CS5.
Is it broken like this for everyone in Photoshop CS5 and 6?
Could this be some twisted attempt to try to optimize painting performance? If so, why isn't there an option to allow a user to request it to update on every operation on a fast computer with cores out the wazoo?
-Noel

More info:
Just poking around in Photoshop CS6 to see what, if anything would make the Histogram display update...
Even though the Refresh icon is disabled (and the "Uncached Refresh" entry in the fly-out menu is grayed-out), double-clicking in the topmost histogram display will force it to update (as described above by Conroy in post #1 above).
If I change the selection Channel field in the Histogram panel, mostly it does not update, but when I change between some of the settings - for example between RGB and Luminosity - the graphs update. Amazingly they revert back to the un-updated state if I switch the channel BACK to what it was!
Making a selection DOES cause it to update.
Choosing Select - Color Range (just starting the function) DOES cause it to update.
Hitting the quick mask mode button DOES cause it to update. Notably Edit in Quick Mask Mode is in the Select menu. Could an association with Select be a clue?
This bug is easy to reproduce, is shown to be a problem across multiple versions and multiple OSs, and in at least one case (Photoshop CS4 x64 on Windows 7 x64 here) it can be shown to work properly, so the code is probably not far off being right. Seems to me this should be the kind of thing a junior engineer could find and fix so someone, say, at Chris Cox's level could have it done before 5 today...
-Noel

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Bug: Histogram Does Not Update when Using Painting Tools

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