### 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)

String code = code_editor->get_text_editor()->get_text();
	int pos = script->get_language()->find_function(p_function, code);
	code_editor->get_text_editor()->remove_secondary_carets();
	if (pos == -1) {
		
		code_editor->get_text_editor()->deselect();
		pos = code_editor->get_text_editor()->get_line_count() + 2;
		String func = script->get_language()->make_function("", p_function, p_args);
		
		code_editor->get_text_editor()->set_caret_line(pos + 1);
		code_editor->get_text_editor()->set_caret_column(1000000); 
		code_editor->get_text_editor()->insert_text_at_caret("\n\n" + func);
	}
	code_editor->get_text_editor()->set_caret_line(pos);
	code_editor->get_text_editor()->set_caret_column(1);
}
bool ScriptTextEditor::show_members_overview() {
	return true;
}
void ScriptTextEditor::update_settings() {