Created attachment 111775 [details] "file already exists" dialog reproducible on Arch Linux (K3b 17.12.3) and neon dev unstable open k3b and create a data project add some files to your project, press ctrl+s and save your project delete some file from your project and press ctrl+s to save K3b shows "file already exists" dialog (see screenshot)
Reproducible on Arch with K3b 18.04.
*** This bug has been marked as a duplicate of bug 437574 ***