### 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
return line_editor->get_text();
}
void FileSystemList::_text_editor_popup_modal_close() {
	if (Input::get_singleton()->is_key_pressed(Key::ESCAPE) ||
			Input::get_singleton()->is_key_pressed(Key::KP_ENTER) ||
			Input::get_singleton()->is_key_pressed(Key::ENTER)) {
		return;
	}
	_line_editor_submit(line_editor->get_text());
}
void FileSystemList::_bind_methods() {
	ADD_SIGNAL(MethodInfo("item_edited"));
}
FileSystemList::FileSystemList() {
	popup_editor = memnew(Popup);
	add_child(popup_editor);
	popup_editor_vb = memnew(VBoxContainer);
	popup_editor_vb->add_theme_constant_override("separation", 0);
	popup_editor_vb->set_anchors_and_offsets_preset(PRESET_FULL_RECT);
	popup_editor->add_child(popup_editor_vb);
	line_editor = memnew(LineEdit);
	line_editor->set_v_size_flags(SIZE_EXPAND_FILL);
	popup_editor_vb->add_child(line_editor);
	line_editor->connect("text_submitted", callable_mp(this, &FileSystemList::_line_editor_submit));
	popup_editor->connect("popup_hide", callable_mp(this, &FileSystemList::_text_editor_popup_modal_close));
}
FileSystemDock *FileSystemDock::singleton = nullptr;
Ref<Texture2D> FileSystemDock::_get_tree_item_icon(bool p_is_valid, String p_file_type) {