Win 7, X3 455, R7 360
Broken: 2.57, 2.70a, rB6d3fdccbd580, 3045011
Short description of error
Using the Poll function does gray out the text entries of menu items, but doesn't the Icons.
Exact steps for others to reproduce the error
Here is a small Add on that represent the issue.
Load factory settings > search for "Test Menu Poll graying out Icons" addon and enable it.
Then in the 3Dview press Q in Object and Edit mode. In Object mode the two menu entries work, while it should be disabled in the Edit mode. Still the icons don't gray out like the text does.