### 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(p_at, text.size());
	_insert_text(p_at, 0, p_text + "\n");
	for (int i = 0; i < carets.size(); i++) {
		if (get_caret_line(i) >= p_at) {
			
			set_caret_line(get_caret_line(i) + 1, false, true, 0, i);
		}
		if (has_selection(i)) {
			if (get_selection_from_line(i) >= p_at) {
				
				select(get_selection_from_line(i) + 1, get_selection_from_column(i), get_selection_to_line(i) + 1, get_selection_to_column(i), i);
			} else if (get_selection_to_line(i) >= p_at) {
				
				select(get_selection_from_line(i), get_selection_from_column(i), get_selection_to_line(i) + 1, get_selection_to_column(i), i);
			}
		}
	}
	
	current_op.end_carets = carets;
	queue_redraw();
}
void TextEdit::insert_text_at_caret(const String &p_text, int p_caret) {