win32k: Ahk: ControlSend function fails to send text

Created an attachment (id=7767)
debug log, r56703

Regtested to rev 56703, Virtualbox 4.1.16. You can replicate the bug by running test2.exe attached. It opens Notepad and sends the following string to it:
C:\Documents and Settings\Administrator\Desktop\new 1.txt

first line - using ControlSend, second - using ControlSendRaw. Then, ALT+s is pressed using SendInput function, to open 'Save As' window. The same string is then sent to filename field, using ControlSend function.

This testcase works (incorrectly) in 56702 (sometimes it has issues with activating window) but in 56703 it fails completely (no text is passed) with the debug log attached.

In 56702 the problem was with wrong text output, which was the original point of this testcase.