### Godot version

Godot 4.1.dev4

### System information

Ubuntu 22.04.2 LTS 22.04 - Vulkan (Forward+) - integrated Intel(R) HD Graphics 4400 (HSW GT2) () - Intel(R) Core(TM) i7-4600U CPU @ 2.10GHz (4 Threads)

### Issue description

![image](https://github.com/godotengine/godot/assets/85438892/a61e8333-d9f0-40ec-a508-d301850d05e9)

Let's suppose I clicked this item, then scrolled around in my script, and I then wanted to check out the warning's line again. It wouldn't work without selecting another item first.

Should be an easy fix by setting `allow_reselect = true` in the underlying tree.

### Steps to reproduce

N/A

### Minimal reproduction project

N/A
switch (p_option) {
		case ACTION_COPY_ERROR: {
			TreeItem *ti = error_tree->get_selected();
			while (ti->get_parent() != error_tree->get_root()) {
				ti = ti->get_parent();
			}
			String type;
			if (ti->has_meta("_is_warning")) {
				type = "W ";
			} else if (ti->has_meta("_is_error")) {
				type = "E ";
			}
			String text = ti->get_text(0) + "   ";
			int rpad_len = text.length();
			text = type + text + ti->get_text(1) + "\n";
			TreeItem *ci = ti->get_first_child();
			while (ci) {
				text += "  " + ci->get_text(0).rpad(rpad_len) + ci->get_text(1) + "\n";
				ci = ci->get_next();
			}
			DisplayServer::get_singleton()->clipboard_set(text);
		} break;