### 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_last_full_visible_line_wrap_index() == 0);
	CHECK(text_edit->get_caret_wrap_index() == 0);
	SEND_GUI_ACTION("ui_text_caret_page_down");
	CHECK(text_edit->get_viewport()->is_input_handled());
	CHECK(text_edit->get_caret_line() == 42);
	CHECK(text_edit->get_first_visible_line() == 21);
	CHECK(text_edit->get_v_scroll() == 21);
	CHECK(text_edit->get_last_full_visible_line() == (visible_lines * 2) - 1);
	CHECK(text_edit->get_last_full_visible_line_wrap_index() == 0);
	CHECK(text_edit->get_caret_wrap_index() == 0);
	SEND_GUI_ACTION("ui_text_caret_page_up");
	CHECK(text_edit->get_viewport()->is_input_handled());
	CHECK(text_edit->get_caret_line() == 22);
	CHECK(text_edit->get_first_visible_line() == 21);
	CHECK(text_edit->get_v_scroll() == 21);
	CHECK(text_edit->get_last_full_visible_line() == (visible_lines * 2) - 1);
	CHECK(text_edit->get_last_full_visible_line_wrap_index() == 0);
	CHECK(text_edit->get_caret_wrap_index() == 0);
	SEND_GUI_ACTION("ui_text_caret_page_up");
	CHECK(text_edit->get_viewport()->is_input_handled());
	CHECK(text_edit->get_caret_line() == 2);
	CHECK(text_edit->get_first_visible_line() == 2);
	CHECK(text_edit->get_v_scroll() == 2);
	CHECK(text_edit->get_last_full_visible_line() == visible_lines + 1);
	CHECK(text_edit->get_last_full_visible_line_wrap_index() == 0);
	CHECK(text_edit->get_caret_wrap_index() == 0);
	
	text_edit->set_caret_line(0);
	text_edit->set_caret_column(0);
	text_edit->set_line_as_first_visible(5);