### 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
all_not_favorites = false;
		} else {
			all_favorites = false;
		}
	}
	if (all_files) {
		if (all_files_scenes) {
			if (filenames.size() == 1) {
				p_popup->add_icon_item(get_theme_icon(SNAME("Load"), SNAME("EditorIcons")), TTR("Open Scene"), FILE_OPEN);
				p_popup->add_icon_item(get_theme_icon(SNAME("CreateNewSceneFrom"), SNAME("EditorIcons")), TTR("New Inherited Scene"), FILE_INHERIT);
				if (GLOBAL_GET("application/run/main_scene") != filenames[0]) {
					p_popup->add_icon_item(get_theme_icon(SNAME("PlayScene"), SNAME("EditorIcons")), TTR("Set As Main Scene"), FILE_MAIN_SCENE);
				}
			} else {
				p_popup->add_icon_item(get_theme_icon(SNAME("Load"), SNAME("EditorIcons")), TTR("Open Scenes"), FILE_OPEN);
			}
			p_popup->add_icon_item(get_theme_icon(SNAME("Instance"), SNAME("EditorIcons")), TTR("Instantiate"), FILE_INSTANTIATE);
			p_popup->add_separator();
		} else if (filenames.size() == 1) {
			p_popup->add_icon_item(get_theme_icon(SNAME("Load"), SNAME("EditorIcons")), TTR("Open"), FILE_OPEN);
			p_popup->add_separator();
		}
		if (filenames.size() == 1) {
			p_popup->add_item(TTR("Edit Dependencies..."), FILE_DEPENDENCIES);
			p_popup->add_item(TTR("View Owners..."), FILE_OWNERS);
			p_popup->add_separator();
		}
	}
	if (p_paths.size() == 1 && p_display_path_dependent_options) {
		PopupMenu *new_menu = memnew(PopupMenu);