### 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
if (p_mouse_button_index != MouseButton::RIGHT) {
		return;
	}
	
	if (searched_string.length() > 0) {
		return;
	}
	current_path = current_path_line_edit->get_text();
	file_list_popup->clear();
	file_list_popup->reset_size();
	file_list_popup->add_icon_item(get_theme_icon(SNAME("Folder"), SNAME("EditorIcons")), TTR("New Folder..."), FILE_NEW_FOLDER);
	file_list_popup->add_icon_item(get_theme_icon(SNAME("PackedScene"), SNAME("EditorIcons")), TTR("New Scene..."), FILE_NEW_SCENE);
	file_list_popup->add_icon_item(get_theme_icon(SNAME("Script"), SNAME("EditorIcons")), TTR("New Script..."), FILE_NEW_SCRIPT);
	file_list_popup->add_icon_item(get_theme_icon(SNAME("Object"), SNAME("EditorIcons")), TTR("New Resource..."), FILE_NEW_RESOURCE);
	file_list_popup->add_icon_item(get_theme_icon(SNAME("TextFile"), SNAME("EditorIcons")), TTR("New TextFile..."), FILE_NEW_TEXTFILE);
	file_list_popup->add_separator();
	file_list_popup->add_icon_shortcut(get_theme_icon(SNAME("Filesystem"), SNAME("EditorIcons")), ED_GET_SHORTCUT("filesystem_dock/show_in_explorer"), FILE_SHOW_IN_EXPLORER);
	file_list_popup->set_position(files->get_screen_position() + p_pos);
	file_list_popup->reset_size();
	file_list_popup->popup();
}
void FileSystemDock::select_file(const String &p_file) {