### 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)

if (!editable) {
		return;
	}
	begin_complex_operation();
	Vector<int> caret_edit_order = get_caret_index_edit_order();
	for (const int &i : caret_edit_order) {
		bool first_line = false;
		if (!p_split_current_line) {
			deselect(i);
			if (p_above) {
				if (get_caret_line(i) > 0) {
					set_caret_line(get_caret_line(i) - 1, false, true, 0, i);
					set_caret_column(text[get_caret_line(i)].length(), i == 0, i);
				} else {
					set_caret_column(0, i == 0, i);
					first_line = true;
				}
			} else {
				set_caret_column(text[get_caret_line(i)].length(), i == 0, i);
			}
		}
		insert_text_at_caret("\n", i);
		if (first_line) {
			set_caret_line(0, i == 0, true, 0, i);
		}
	}
	end_complex_operation();
}
void TextEdit::_move_caret_left(bool p_select, bool p_move_by_word) {