Mac OS X - 'Sort by' shortcuts show ? instead of ^

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Under Mac OS X, the 'Sort by Extension', 'Sort by Name', 'Sort by Size' ... items of the 'View' menu indicate that their associated shortcut's modifier is Command ? (e.g. ?F3), even though the actual modifier is Control (^{). (see attached screenshot)
Note that the 'Sort by' shortcuts function normally and can be triggered with the Control key as they should. In other words, this is just a cosmetic issue.}

The bug has been traced down to JCheckBoxMenuItem which doesn't properly render the Control ^{modifier and replaces it by ?. The attached test class demonstrates the problem.}

Additional information :
- this issue doesn't affect JMenuItem, only JCheckBoxMenuItem
- it only happens when the "apple.laf.useScreenMenuBar" property is set to "true"
- this issue has been last reproduced under Mac OS X 10.5 / Java 1.5 but has been there for as long as I can remember, probably since Mac OS X 10.1 or 10.2.
- no known workaround

This clearly is an issue in Apple's Java implementation. As such, this should be reported back to Apple.

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Bug screenshot

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CheckboxMenuItemAcceleratorBug?.java

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[ppagee@…]

It is more complex - it is not even possible to change those shortcuts. If I redefine shortcut to something like:

<action class="com.mucommander.ui.action.SortByExtensionAction?" keystroke="alt meta F3"/>

The shortcut is still displayed as "meta F3" and both shortcuts work (instead of just "alt meta F3"). Similar shortcuts for other actions work (and replace defaults).

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No longer reproducible with the recently released "Java for Mac OS X 10.5 Update 4":
shortcut modifiers are displayed correctly (ctrl F3 is no longer displayed as meta F3) and seem to work as they should (alt meta F3 can no longer be triggered by meta F3).