If you hold for example a cookie / sword / bow in your hand, start punching something and right click to eat / block / charge. Then you do both the same time.
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is duplicated by 4
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Well anyway, i don't think it's a bug.
If we take a example: real life.
You can punch something while eating.
In my opinion, it's not that much of a deal.
Confirmed in 1.4.5.

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been deliviered.
Confirmed. It's been this way since the hunger bar was implemented.