### 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)

MessageQueue::get_singleton()->flush();
	CHECK(text_edit->get_first_visible_line() == 5);
	SEND_GUI_KEY_EVENT(Key::A);
	CHECK(text_edit->get_first_visible_line() == 0);
	text_edit->set_line_as_first_visible(5);
	MessageQueue::get_singleton()->flush();
	CHECK(text_edit->get_first_visible_line() == 5);
	text_edit->undo();
	MessageQueue::get_singleton()->flush();
	CHECK(text_edit->get_first_visible_line() == 0);
	text_edit->set_line_as_first_visible(5);
	MessageQueue::get_singleton()->flush();
	CHECK(text_edit->get_first_visible_line() == 5);
	text_edit->redo();
	MessageQueue::get_singleton()->flush();
	CHECK(text_edit->get_first_visible_line() == 0);
	memdelete(text_edit);
}
TEST_CASE("[SceneTree][TextEdit] setter getters") {
	TextEdit *text_edit = memnew(TextEdit);
	SceneTree::get_singleton()->get_root()->add_child(text_edit);
	SUBCASE("[TextEdit] set and get placeholder") {
		text_edit->set_placeholder("test\nplaceholder");
		CHECK(text_edit->get_placeholder() == "test\nplaceholder");
		CHECK(text_edit->get_text() == "");
		CHECK(text_edit->get_line_count() == 1);
		CHECK(text_edit->get_last_full_visible_line() == 0);
	}
	SUBCASE("[TextEdit] highlight current line") {
		text_edit->set_highlight_current_line(true);