Ctrl-D sometimes propagates to other windows

[ivankozik]

Pressing Ctrl-D to close a clj-swingrepl window sometimes propagates the key/close event to another window, closing more than the REPL than you intended to close. This happens even if the other REPL is in another process.

Tested on Windows; might not happen elsewhere.

[ivankozik]

Looks like a Ctrl-D in another application entirely can make clj-swingrepl quit (as long as clj-swingrepl receives focus next). I guess there's some keyup/keydown logic that needs fixing.