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XFilterEvent - filter X
events for an input method 
- Bool XFilterEvent(XEvent *event, Window
w);  
- event
- Specifies the v. 
- w
- Specifies the window for which the
filter is to be applied. 
If the window argument is None,   XFilterEvent
  applies the filter to the window specified in the XEvent   structure.
The window argument is provided so that layers above Xlib that do event
redirection can indicate to which window an event has been redirected.
If
XFilterEvent   returns True,   then some input method has filtered the
event, and the client should discard the event. If XFilterEvent   returns
False,   then the client should continue processing the event. 
If a grab
has occurred in the client and XFilterEvent   returns True,   the client
should ungrab the keyboard. 
XNextEvent(3X11)
 
Xlib - C Language X Interface 
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