### 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)

}
			if (has_color) {
				color_panel->set_position(get_screen_position() + local_pos);
			}
		}
		_make_context_menu(tx->has_selection(), has_color, foldable, open_docs, goto_definition, local_pos);
	}
}
void ScriptTextEditor::_color_changed(const Color &p_color) {
	String new_args;
	if (p_color.a == 1.0f) {
		new_args = String("(" + rtos(p_color.r) + ", " + rtos(p_color.g) + ", " + rtos(p_color.b) + ")");
	} else {
		new_args = String("(" + rtos(p_color.r) + ", " + rtos(p_color.g) + ", " + rtos(p_color.b) + ", " + rtos(p_color.a) + ")");
	}
	String line = code_editor->get_text_editor()->get_line(color_position.x);
	String line_with_replaced_args = line.replace(color_args, new_args);
	color_args = new_args;
	code_editor->get_text_editor()->begin_complex_operation();
	code_editor->get_text_editor()->set_line(color_position.x, line_with_replaced_args);
	code_editor->get_text_editor()->end_complex_operation();
	code_editor->get_text_editor()->queue_redraw();
}
void ScriptTextEditor::_prepare_edit_menu() {
	const CodeEdit *tx = code_editor->get_text_editor();
	PopupMenu *popup = edit_menu->get_popup();
	popup->set_item_disabled(popup->get_item_index(EDIT_UNDO), !tx->has_undo());
	popup->set_item_disabled(popup->get_item_index(EDIT_REDO), !tx->has_redo());
}
void ScriptTextEditor::_make_context_menu(bool p_selection, bool p_color, bool p_foldable, bool p_open_docs, bool p_goto_definition, Vector2 p_pos) {