### 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)

code_editor->get_text_editor()->set_gutter_draw(connection_gutter, EDITOR_GET("text_editor/appearance/gutters/show_info_gutter"));
	code_editor->update_editor_settings();
}
bool ScriptTextEditor::is_unsaved() {
	const bool unsaved =
			code_editor->get_text_editor()->get_version() != code_editor->get_text_editor()->get_saved_version() ||
			script->get_path().is_empty(); 
	return unsaved;
}
Variant ScriptTextEditor::get_edit_state() {
	return code_editor->get_edit_state();
}
void ScriptTextEditor::set_edit_state(const Variant &p_state) {
	code_editor->set_edit_state(p_state);
	Dictionary state = p_state;
	if (state.has("syntax_highlighter")) {
		int idx = highlighter_menu->get_item_idx_from_text(state["syntax_highlighter"]);
		if (idx >= 0) {
			_change_syntax_highlighter(idx);
		}
	}
	if (editor_enabled) {
#ifndef ANDROID_ENABLED
		ensure_focus();
#endif
	}
}
Variant ScriptTextEditor::get_navigation_state() {