### 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)

return script;
}
void ScriptTextEditor::set_edited_resource(const Ref<Resource> &p_res) {
	ERR_FAIL_COND(script.is_valid());
	ERR_FAIL_COND(p_res.is_null());
	script = p_res;
	code_editor->get_text_editor()->set_text(script->get_source_code());
	code_editor->get_text_editor()->clear_undo_history();
	code_editor->get_text_editor()->tag_saved_version();
	emit_signal(SNAME("name_changed"));
	code_editor->update_line_and_column();
}
void ScriptTextEditor::enable_editor(Control *p_shortcut_context) {
	if (editor_enabled) {
		return;
	}
	editor_enabled = true;
	_enable_code_editor();
	_validate_script();
	if (p_shortcut_context) {
		for (int i = 0; i < edit_hb->get_child_count(); ++i) {
			Control *c = cast_to<Control>(edit_hb->get_child(i));
			if (c) {
				c->set_shortcut_context(p_shortcut_context);
			}
		}
	}
}
void ScriptTextEditor::_load_theme_settings() {