Request for review 7151821: [macosx] Mnemonic doesn't work in JTabbedPane

[Alexander Scherbatiy]

Please review a fix for 7151821.

webrev: http://cr.openjdk.java.net/~alexsch/7151821/webrev.00/


This is a fix for regression after switching using [event 
charactersIgnoringModifiers] string to [event characters] during the 
MACOSX_PORT-568 issue fixing:
http://java.net/jira/browse/MACOSX_PORT-568
http://hg.openjdk.java.net/jdk7u/jdk7u-osx/jdk/rev/5780795f381e

The characters string is null during Ctrl+Alt+Char mnemonic pressing.

According to the NSEvent charactersIgnoringModifiers doc:
This method returns the non-modifier key character pressed for dead 
keys, such as Option-e.
For example, Option-e (no shift key) returns an “e" for this method, 
whereas the characters method returns an empty string.

The fix uses the charactersIgnoringModifiers string for the keychar when 
the Ctrl+Alt mnemonic key combination is pressed.

Thanks,
Alexandr.