Please allow "Find similar" to be interrupted

[rsbrux]

I find XnView's "Find similar" function very useful, but I sometimes give it too big of an assignment. If I change my mind and try to Cancel the operation, XnView MP generally doesn't respond to the Cancel button. This often leaves me no other choice but to force a hard shutdown, by holding down the PC's power button. please make it easier to interrupt "Find similar".

P.S. During "Find similar" XnView MP also fails to respond to the Windows shtudown request. When I was unable to cancel "Find similar", I tried to shut down Windows. Over 2 hours later, it is still "Shutting down".