Preview Feature

[onesounds]

I made it by looking at this post. #683
you can test this build. https://ci.appveyor.com/project/JohnTheGr8/flow-launcher/builds/41177912/artifacts

• Currently, it opens when you press f1, and disappears when you press it one more time. It is useful when looking at long file paths Now, basically, it displays just item results.

• At first, it was displayed when alt was pressed, and when the button was released, it disappeared. There was an opinion that it would be uncomfortable, so I changed it to toggle.

• I tried not to turn it on when there was no query. When it was made possible to turn it on, it seemed to be available in various ways. (Like fluid search, you can see your favorite apps)

• There was an opinion that the area could be used as a plug-in.

• I think it's better to have the basic function built-in, not the plug-in itself, and I think it's good to allow the plug-in to use that area if necessary. It seems to be a function that requires a high-resolution image preview.

• If the path is too long, the area area becomes larger. It bothers me if the height keeps changing when changing items. This height seems appropriate for now.