mono/xwt — pull request #317 by lytico (2014-04-03 02:39:45+00:00)
Title: WPFBackend.KeyboardUtil: calculation of keys is messed up

currently the function-keys, the number-keys, the lower-case-letter-keys and the numpad-number-keys are translated wrong to Xwt.Key.
This patch uses refactoring-proof consts to calculate the keys.