Fixing KIO copy to USB stick and network filesystems

This blog post details the long journey to fix a critical 15-year-old bug in KIO regarding file copying to USB sticks and network filesystems. The issue resulted in misleading progress indicators when transferring files, often leading users to believe their data was securely copied when it wasn't. The author, a contributor to KIO, explains the technical challenges encountered, the solutions implemented, and the improvements in handling file transfers accurately without slowing down the copying process. Overall, it provides an insightful look into software development and debugging in the context of a real-world application.