Wrong keyChars generated for Control characters

When the a key combination using the CTRL modifier is typed, the wrong
keyCharacter is generated. The behavior is different on Windows than
on Solaris, but it is wrong on both. A test case is provided below.

The behavior I would expect when typing CTRL-d into the textField
in the test case is similar to the behavior I see when typing ALT-d
or SHIFT-d into the textField. It should look like this:

params= KEY_PRESSED,keyCode=17,keyChar='?'
KeyChar: ? = 65535
keyText= Ctrl

params= KEY_PRESSED,keyCode=68,keyChar='d',modifiers=Ctrl
KeyChar: d = 100
keyText= D

params= KEY_TYPED,keyCode=0,keyChar='d'
KeyChar: d = 100
keyText= Unknown keyCode: 0x0

params= KEY_RELEASED,keyCode=68,keyChar='d',modifiers=Ctrl
KeyChar: d = 100
keyText= D

params= KEY_RELEASED,keyCode=17,keyChar='?',modifiers=Ctrl
KeyChar: ? = 65535
keyText= Ctrl


On Solaris, typing control characters produces garbage output on the xterm
to which the ouput is sent. Even closing the application doesn't help -
subsequent keypresses produce only garbage. The window has to be closed
since it is now useless.

The situation is not as bad on Windows. The keyCharacters are wrong,
but that's about it. Here is some sample output:
 
params= KEY_PRESSED,keyCode=17,keyChar='?',modifiers=Ctrl
KeyChar: ? = 65535
keyText= Ctrl

params= KEY_PRESSED,keyCode=68,keyChar='?',modifiers=Ctrl
KeyChar: ? = 4
keyText= D

params= KEY_TYPED,keyCode=0,keyChar='?',modifiers=Ctrl
KeyChar: ? = 4
keyText= Unknown keyCode: 0x0

params= KEY_RELEASED,keyCode=68,keyChar='?',modifiers=Ctrl
KeyChar: ? = 4
keyText= D

params= KEY_RELEASED,keyCode=17,keyChar='?'
KeyChar: ? = 65535
keyText= Ctrl


On the Windows (DOS) output, the keyChar appears as extended characters,
not as question marks.