Version:           3.5.2 (using KDE Devel)
Installed from:    Compiled sources
Compiler:          gcc-3.4.5 -march=athlon-xp -O2 -pipe -fomit-frame-pointer
OS:                Linux

When dragging a file to the same directory, Konqueror does not show any more the dialog suggesting to rename the file. Instead, a simple information window appears with the message:
"The source and destination are the same file."
Now it is just impossible to create a copy of a file in the same directory.
However, making a copy of a directory is absolutely possible.

To recreate the bug:
1. Open Konqueror
2. Drag a single file within the same directory and release the mouse button.