As the title shows, this feature is the same as what is experienced in IDEA. It will compare the selected words with those in the clipboard. Its appearance can be as simple as the plugin Large Type, or maybe images saved to the clipboard, or images that can be pinned wherever you like. Words from the clipboard are shown as the base content; green under colored words indicate newly added content, while red under colored words with a strikethrough indicate deleted content. Highlight the words changed/different.
Here’s the screenshot I took from IDEA of this feature.
It could be quite handy isn’t it?