### 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
switch (p_what) {
		case NOTIFICATION_TRANSLATION_CHANGED:
		case NOTIFICATION_LAYOUT_DIRECTION_CHANGED:
		case NOTIFICATION_ENTER_TREE: {
			if (initialized) {
				return;
			}
			initialized = true;
			EditorFeatureProfileManager::get_singleton()->connect("current_feature_profile_changed", callable_mp(this, &FileSystemDock::_feature_profile_changed));
			EditorFileSystem::get_singleton()->connect("filesystem_changed", callable_mp(this, &FileSystemDock::_fs_changed));
			EditorResourcePreview::get_singleton()->connect("preview_invalidated", callable_mp(this, &FileSystemDock::_preview_invalidated));
			button_reload->set_icon(get_theme_icon(SNAME("Reload"), SNAME("EditorIcons")));
			button_toggle_display_mode->set_icon(get_theme_icon(SNAME("Panels2"), SNAME("EditorIcons")));
			button_file_list_display_mode->connect("pressed", callable_mp(this, &FileSystemDock::_toggle_file_display));
			files->connect("item_activated", callable_mp(this, &FileSystemDock::_file_list_activate_file));
			button_hist_next->connect("pressed", callable_mp(this, &FileSystemDock::_fw_history));
			button_hist_prev->connect("pressed", callable_mp(this, &FileSystemDock::_bw_history));
			tree_search_box->set_right_icon(get_theme_icon(SNAME("Search"), SNAME("EditorIcons")));
			tree_search_box->set_clear_button_enabled(true);
			tree_button_sort->set_icon(get_theme_icon(SNAME("Sort"), SNAME("EditorIcons")));
			file_list_search_box->set_right_icon(get_theme_icon(SNAME("Search"), SNAME("EditorIcons")));
			file_list_search_box->set_clear_button_enabled(true);
			file_list_button_sort->set_icon(get_theme_icon(SNAME("Sort"), SNAME("EditorIcons")));
			if (is_layout_rtl()) {