### 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)

ERR_FAIL_INDEX_V(p_line, text.size(), 0);
	if (!is_line_wrapped(p_line)) {
		return 0;
	}
	return text.get_line_wrap_amount(p_line);
}
int TextEdit::get_line_wrap_index_at_column(int p_line, int p_column) const {
	ERR_FAIL_INDEX_V(p_line, text.size(), 0);
	ERR_FAIL_COND_V(p_column < 0, 0);
	ERR_FAIL_COND_V(p_column > text[p_line].length(), 0);
	if (!is_line_wrapped(p_line)) {
		return 0;
	}
	
	int wrap_index = 0;
	int col = 0;
	Vector<String> lines = get_line_wrapped_text(p_line);
	for (int i = 0; i < lines.size(); i++) {
		wrap_index = i;
		String s = lines[wrap_index];
		col += s.length();
		if (col > p_column) {
			break;
		}
	}
	return wrap_index;
}
Vector<String> TextEdit::get_line_wrapped_text(int p_line) const {