### 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)

text_edit->add_selection_for_next_occurrence();
			CHECK(text_edit->get_caret_count() == 3);
			CHECK(text_edit->get_selected_text(2) == "test");
			CHECK(text_edit->get_selection_from_line(2) == 2);
			CHECK(text_edit->get_selection_from_column(2) == 9);
			CHECK(text_edit->get_selection_to_line(2) == 2);
			CHECK(text_edit->get_selection_to_column(2) == 13);
			CHECK(text_edit->get_caret_line(2) == 2);
			CHECK(text_edit->get_caret_column(2) == 13);
			text_edit->add_selection_for_next_occurrence();
			CHECK(text_edit->get_caret_count() == 4);
			CHECK(text_edit->get_selected_text(3) == "test");
			CHECK(text_edit->get_selection_from_line(3) == 3);
			CHECK(text_edit->get_selection_from_column(3) == 5);
			CHECK(text_edit->get_selection_to_line(3) == 3);
			CHECK(text_edit->get_selection_to_column(3) == 9);
			CHECK(text_edit->get_caret_line(3) == 3);
			CHECK(text_edit->get_caret_column(3) == 9);
			
			text_edit->add_caret(2, 1);
			text_edit->select(2, 0, 2, 4, 4);
			CHECK(text_edit->get_selected_text(4) == "rand");
			text_edit->add_selection_for_next_occurrence();
			CHECK(text_edit->get_caret_count() == 6);
			CHECK(text_edit->get_selected_text(5) == "rand");
			CHECK(text_edit->get_selection_from_line(5) == 3);
			CHECK(text_edit->get_selection_from_column(5) == 18);
			CHECK(text_edit->get_selection_to_line(5) == 3);
			CHECK(text_edit->get_selection_to_column(5) == 22);
			CHECK(text_edit->get_caret_line(5) == 3);