The autocompletion popup is all jumpy because of the different size of the snippets

When moving in the list of the suggested snippets, the preview area is updated with the currently focused snippet. The problem is that the snippets are not the same size, making the list jump around.

When presenting a list to the user, the list should move as little as possible so that is is easy to target a specific item.

See below; the preview areas are not the same size, and since the popup is fixed from the bottom, it makes the list move up & down.