### 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
#include "scene/resources/packed_scene.h"
#include "servers/display_server.h"
Control *FileSystemTree::make_custom_tooltip(const String &p_text) const {
	TreeItem *item = get_item_at_position(get_local_mouse_position());
	if (!item) {
		return nullptr;
	}
	return FileSystemDock::get_singleton()->create_tooltip_for_path(item->get_metadata(0));
}
Control *FileSystemList::make_custom_tooltip(const String &p_text) const {
	int idx = get_item_at_position(get_local_mouse_position());
	if (idx == -1) {
		return nullptr;
	}
	return FileSystemDock::get_singleton()->create_tooltip_for_path(get_item_metadata(idx));
}
void FileSystemList::_line_editor_submit(String p_text) {
	popup_editor->hide();
	emit_signal(SNAME("item_edited"));
	queue_redraw();
}
bool FileSystemList::edit_selected() {
	ERR_FAIL_COND_V_MSG(!is_anything_selected(), false, "No item selected.");
	int s = get_current();
	ensure_current_is_visible();
	Rect2 rect;
	Rect2 popup_rect;
	Vector2 ofs;
	Vector2 icon_size = get_item_icon(s)->get_size();