[Feature request] Only show the preview panel for specific plugins.

**Is your feature request related to a problem? Please describe.**
The preview panel is nice, but only sometimes. Like when using the Movie plugin to search for stuff on IMDB, but having to press F1 just to get a preview those times when you need it feels a bit too much.

**Describe the solution you'd like**
Have an option to only show the preview only when using some of the plugins. So when I type "imdb" it opens up the preview panel, or when I search for images.

**Describe alternatives you've considered**
Pressing F1, but doing that every time feels a bit awkward.