### Godot version

4.0 stable

### System information

Manjaro Linux, kernel 6.1.1-1-MANJARO, AMD Ryzen 5 3600, AMD RX 580

### Issue description

The `wrap_mode` property of the `TextEdit` node doesn't seem to really do anything. Setting it to `LINE_WRAPPING_BOUNDARY` simply means that there won't be an horizontal scrollbar if the text overshoots the boundary, instead of actually forcing the text to the next line so that it stays visible.

### Steps to reproduce

Create a TextEdit node and set its `wrap_mode` property to `LINE_WRAPPING_BOUNDARY`

### Minimal reproduction project

[WrapBugDemo.zip](https://github.com/godotengine/godot/files/10875969/WrapBugDemo.zip)

StringBuilder ret_text;
	const int text_size = text.size();
	for (int i = 0; i < text_size; i++) {
		ret_text += text[i];
		if (i != text_size - 1) {
			ret_text += "\n";
		}
	}
	return ret_text.as_string();
}
int TextEdit::get_line_count() const {
	return text.size();
}
void TextEdit::set_placeholder(const String &p_text) {