Disable clipboard_event_selection_request call is overkill for
blocking text/image/file purpose.
For example, it breaks existing behavior (slow response from gedit,
gimp as a side effects)
Instead, in clipboard_event_selection_request, these media format will
be blocked respectively which depends on the following configurations
in sesman.ini [Security] section.
* RestrictInboundClipboard=text
* RestrictInboundClipboard=file
* RestrictInboundClipboard=image
You can also set comma separated list.
* RestrictInboundClipboard=text,file,image
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