Precise Gaussian could be less single-minded

[Robert Schleif]

Once Precise Gaussion begins, it ignores the cancel button until it is finished. This can be inconvenient if the blurring operation is going to take a while.

[jsachs]

You can actually cancel, but due to some strange Windows behavior that I have never been able to figure out, you may need to click the Cancel button more than once to get it to be recognized.

[Robert Schleif]

Yep, clicking twice works. Thanks. I guess I should be more open-minded.

[jsachs]

It looks like you need to click twice in rapid succession to get it to respond.

For the next release I was able to implement a workaround to make clicking Cancel work on the first click. As before, there can be a brief delay before it takes effect since it needs to wait for the progress bar to advance. Thanks for prodding me to revisit this as I have spent hours over the years trying to figure out why it wasn't working on the first click. I ended up simulating the Cancel button instead of using a real button.