### Godot version

v4.0.beta10.official [d0398f62f]

### System information

Windows 22H2, Compatibility, GeForce GTX 550 Ti

### Issue description

Multiple lines of error messages are copied without line breaks:
The script editor's error panel shows:
```
Line 6:Expected parameter name.
Line 6:Expected closing ")" after function parameters.
Line 6:Expected ":" after function declaration.
```
But selecting and copying them `ctrl c`, copies them without line breaks:
```
Line 6:Expected parameter name.Line 6:Expected closing ")" after function parameters.Line 6:Expected ":" after function declaration.
```


### Steps to reproduce

- start Godot
- open the attached project
- open the script `Node2D.gd`
The status bar shows an error message.
- click on the red circle with an x in it, and the number 3 to the right of the circle.
The script editor's error panel shows three messages:
>Line 6:Expected parameter name.
Line 6:Expected closing ")" after function parameters.
Line 6:Expected ":" after function declaration.

- select all three lines, and copy them `ctrl c`
- in the script editor, click on the empty line 12 to place the cursor there.
- paste `ctrl v`

### Expected
The copied lines should be pasted on three lines, as they appeared in the error panel.

### Observed
There are no line breaks, they appear on the same line:
```
Line 6:Expected parameter name.Line 6:Expected closing ")" after function parameters.Line 6:Expected ":" after function declaration.
```


### Minimal reproduction project

[issue, error messages copied without line breaks.zip](https://github.com/godotengine/godot/files/10361376/issue.error.messages.copied.without.line.breaks.zip)

nodes[i]->get_signals_connected_to_this(&signal_connections);
		for (const Connection &connection : signal_connections) {
			if (!(connection.flags & CONNECT_PERSIST)) {
				continue;
			}
			
			Node *source = Object::cast_to<Node>(connection.signal.get_object());
			if (source && !source->is_inside_tree()) {
				continue;
			}
			const StringName method = connection.callable.get_method();
			if (methods_found.has(method)) {
				continue;
			}
			if (!ClassDB::has_method(script->get_instance_base_type(), method)) {
				int line = -1;
				for (int j = 0; j < functions.size(); j++) {
					String name = functions[j].get_slice(":", 0);
					if (name == method) {
						Dictionary line_meta;
						line_meta["type"] = "connection";
						line_meta["method"] = method;
						line = functions[j].get_slice(":", 1).to_int() - 1;
						text_edit->set_line_gutter_metadata(line, connection_gutter, line_meta);
						text_edit->set_line_gutter_icon(line, connection_gutter, get_parent_control()->get_theme_icon(SNAME("Slot"), SNAME("EditorIcons")));
						text_edit->set_line_gutter_clickable(line, connection_gutter, true);
						methods_found.insert(method);
						break;
					}
				}