user32:dialog.c: Prevention endless loop.

[Anatoly Lyutin]

A possibly to receive  a endless loop if a Tabs messages are processed 
in dialog box through IsDialogMessageW .
The reaction of Tabs on WM_GETDLGCODE is return DLGC_WANTARROWS | 
DLGC_WANTCHARS.
WM_KEYDOWN process in IsDialogMessageW in WM_SYSCHAR case. In this case 
calls a DIALOG_IsAccelerator function. Inside this function is do-while 
loop and send WM_GETDLGCODE message. When this message is send to Tabs 
it originates endless loop.

Should help on bug #9781


Changelog:
   Prevention endless loop.

-- 
Best regards
	Anatoly Lyutin.

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