Creates a thumbnail of image for the given file
This procedure creates a thumbnail for the given file and stores it according to relevant standards. In particular, it will
follow the [Free Desktop Thumbnail Managing Standard](https://specifications.freedesktop.org/thumbnail-spec/late st/thumbsave.html) when
relevant.
The thumbnail is stored so that it belongs to the given file. This means you have to save image under this name
first. As a fallback, the call will work if image was exported or imported as file. In any other case, this
procedure will fail.
| image |
The image. |
| file |
The file the thumbnail belongs to. |
|
TRUE on success. |