### 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)

emit_signal(SNAME("request_help"), text);
			}
		} break;
		case LOOKUP_SYMBOL: {
			String text = tx->get_word_under_caret(0);
			if (text.is_empty()) {
				text = tx->get_selected_text(0);
			}
			if (!text.is_empty()) {
				_lookup_symbol(text, tx->get_caret_line(0), tx->get_caret_column(0));
			}
		} break;
	}
}
void ScriptTextEditor::_edit_option_toggle_inline_comment() {
	if (script.is_null()) {
		return;
	}
	String delimiter = "#";
	List<String> comment_delimiters;
	script->get_language()->get_comment_delimiters(&comment_delimiters);
	for (const String &script_delimiter : comment_delimiters) {
		if (!script_delimiter.contains(" ")) {
			delimiter = script_delimiter;
			break;
		}
	}
	code_editor->toggle_inline_comment(delimiter);
}
void ScriptTextEditor::add_syntax_highlighter(Ref<EditorSyntaxHighlighter> p_highlighter) {