### 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
files->set_fixed_icon_size(Size2(thumbnail_size, thumbnail_size));
		if (thumbnail_size < 64) {
			folder_thumbnail = get_theme_icon(SNAME("FolderMediumThumb"), SNAME("EditorIcons"));
			file_thumbnail = get_theme_icon(SNAME("FileMediumThumb"), SNAME("EditorIcons"));
			file_thumbnail_broken = get_theme_icon(SNAME("FileDeadMediumThumb"), SNAME("EditorIcons"));
		} else {
			folder_thumbnail = get_theme_icon(SNAME("FolderBigThumb"), SNAME("EditorIcons"));
			file_thumbnail = get_theme_icon(SNAME("FileBigThumb"), SNAME("EditorIcons"));
			file_thumbnail_broken = get_theme_icon(SNAME("FileDeadBigThumb"), SNAME("EditorIcons"));
		}
	} else {
		
		files->set_icon_mode(ItemList::ICON_MODE_LEFT);
		files->set_max_columns(1);
		files->set_max_text_lines(1);
		files->set_fixed_column_width(0);
		files->set_fixed_icon_size(Size2());
	}
	Ref<Texture2D> folder_icon = (use_thumbnails) ? folder_thumbnail : get_theme_icon(SNAME("folder"), SNAME("FileDialog"));
	const Color folder_color = get_theme_color(SNAME("folder_icon_color"), SNAME("FileDialog"));
	
	List<FileInfo> file_list;
	if (current_path == "Favorites") {
		
		Vector<String> favorites_list = EditorSettings::get_singleton()->get_favorites();
		for (const String &favorite : favorites_list) {
			String text;
			Ref<Texture2D> icon;
			if (favorite == "res://") {
				text = "/";