### 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)

CHECK(text_edit->get_scroll_pos_for_line(1, -1) == 0);
	CHECK(text_edit->get_scroll_pos_for_line(1, 100) == 0);
	ERR_PRINT_ON;
	text_edit->set_h_scroll(-100);
	CHECK(text_edit->get_h_scroll() == 0);
	text_edit->set_h_scroll(10000000);
	CHECK(text_edit->get_h_scroll() == 314);
	text_edit->set_h_scroll(-100);
	CHECK(text_edit->get_h_scroll() == 0);
	text_edit->set_smooth_scroll_enabled(false);
	CHECK(text_edit->get_first_visible_line() == 0);
	CHECK(text_edit->get_v_scroll() == 0);
	CHECK(text_edit->get_last_full_visible_line() == visible_lines - 1);
	CHECK(text_edit->get_last_full_visible_line_wrap_index() == 0);
	text_edit->grab_focus();
	SEND_GUI_ACTION("ui_text_scroll_down");
	CHECK(text_edit->get_viewport()->is_input_handled());
	CHECK(text_edit->get_caret_line() == 1);
	CHECK(text_edit->get_first_visible_line() == 1);
	CHECK(text_edit->get_v_scroll() == 1);
	CHECK(text_edit->get_last_full_visible_line() == visible_lines);
	CHECK(text_edit->get_last_full_visible_line_wrap_index() == 0);
	CHECK(text_edit->get_caret_wrap_index() == 0);
	SEND_GUI_ACTION("ui_text_scroll_up");
	CHECK(text_edit->get_viewport()->is_input_handled());
	CHECK(text_edit->get_caret_line() == 1);
	CHECK(text_edit->get_first_visible_line() == 0);
	CHECK(text_edit->get_v_scroll() == 0);
	CHECK(text_edit->get_last_full_visible_line() == visible_lines - 1);
	CHECK(text_edit->get_last_full_visible_line_wrap_index() == 0);