On windows, Notepad++ compare plugin let’s you compare unsaved files. So to compare two texts copied from elsewhere, just make two new tabs and paste the texts. Compare plugin will happily compare line by line.
On Linux I havent found something similar. The closes is Kate, but you still have to save tmp1.txt and tmp2.txt , and remove the clutter when finished.
Does anybody know a compare app that just lets you paste two text blocks without saving files first?


You’re not wrong, but… Yuck
I have no hangups about using Wine for games and Windows only special snowflake apps. But a text editor through wine on Linux just feels dirty xD
I didn’t say it was ideal, but if nothing else has the feature you want, it would work!