### Godot version

v4.1.rc2.official [46424488e]

### System information

Godot v4.1.rc2 - Linux Mint 20 (Ulyana) - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2060 SUPER (nvidia; 515.105.01) - Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz (8 Threads)

### Issue description

Dragging and dropping a file to a new position inside its current folder, or onto the icon for its current folder - when that folder is the project root folder :res// - will be treated as though you were dropping a different file with the same name.

Expectation: for nothing to happen.

Also tried it in 4.0.3 and 4.1-dev3, where it behaves as expected.

https://github.com/godotengine/godot/assets/64640811/90de1120-dd92-41b8-b202-db77c343103a

### Steps to reproduce

1. New or existing project.
2. Click and drag a file in :res// in FileSystem dock.
3. Drop the file back into :res//.
4. Be prompted to overwrite or rename.

### Minimal reproduction project

N/A
_set_scanning_mode();
	EditorFileSystem::get_singleton()->scan();
}
void FileSystemDock::_toggle_split_mode(bool p_active) {
	set_display_mode(p_active ? DISPLAY_MODE_SPLIT : DISPLAY_MODE_TREE_ONLY);
	emit_signal(SNAME("display_mode_changed"));
}
void FileSystemDock::fix_dependencies(const String &p_for_file) {
	deps_editor->edit(p_for_file);
}
void FileSystemDock::focus_on_filter() {