If the "paste" is contained in a 3-buttons button,or there is a quote in the "paste" button, preview can't be accessiable.
Three-Buttons have to show a tooltip listing the commands on all three buttons so I don't know if it would make sense for them.
In the three-button button, it is better to display the tooltip and the clipboard content at the same time.
In addition, when the clipboard contains an image, the image is displayed directly below the text (as shown below), and could set the preview size must be better.
