gdk_window_add_filter breaking GDK and/or GTK+

[Siddharth Uppal <siddharthuppal yahoo co in>]

Hi all,

The documentation of gdk-window-add-filter function
(http://developer.gnome.org/doc/API/2.0/gdk/gdk-Windows.html#gdk-window-add-filter)
says that:

Adds an event filter to window, allowing you to
intercept events before they reach GDK. **This is a
low-level operation and makes it easy to break GDK
and/or GTK+, so you have to know what you're doing.**
Pass NULL for window to get all events for all
windows, instead of events for a specific window.

How can gdk_window_add_filter function break GDK
and/or GTK+?

Regards,
Siddharth

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