Button to minimize inline images (ex: GIFs plugin)
Users can minimize an image preview of an URL that is directly pasted in the message, with the cross button at the top left corner. However, there is no such button if the same image is inlined with the folowwing syntax ![Description'](https://example-url/test.gif).
It'd be useful to have a way of minimizing inline images, like Slack does and like Mattermost does for raw URL previews.
This is a follow-up on multiple requests from the users of moussetc/mattermost-plugin-giphy on GitHub (Issue 12).