### 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)

int final_line = text_editor->get_line_count() - 1;
	String line = text_editor->get_line(final_line);
	
	if (line.length() > 0 && !line.ends_with("\n")) {
		text_editor->begin_complex_operation();
		line += "\n";
		text_editor->set_line(final_line, line);
		text_editor->end_complex_operation();
		text_editor->queue_redraw();
	}
}
void CodeTextEditor::convert_case(CaseStyle p_case) {
	if (!text_editor->has_selection()) {
		return;
	}
	text_editor->begin_complex_operation();
	Vector<int> caret_edit_order = text_editor->get_caret_index_edit_order();
	for (const int &c : caret_edit_order) {
		if (!text_editor->has_selection(c)) {
			continue;
		}
		int begin = text_editor->get_selection_from_line(c);
		int end = text_editor->get_selection_to_line(c);
		int begin_col = text_editor->get_selection_from_column(c);
		int end_col = text_editor->get_selection_to_column(c);
		for (int i = begin; i <= end; i++) {
			int len = text_editor->get_line(i).length();