### Godot version

v4.0.beta.custom_build [13f0158]

### System information

Windows 10

### Issue description

When doing operations (`begin_complex_operation` and `end_complex_operation`) with multiple selections in TextEdit, some of these selections don't revert upon undo. This behavior is affects some of script editor's operations, like duplicate selection and delete lines.

### Steps to reproduce

Open script editor, make multiple selections. Keep in mind what you have selected. Do duplicate selection (ctrl+shift+D). Undo (ctrl+Z). Compare the result to what you remember.

### Minimal reproduction project

N/A
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);
			CHECK(text_edit->get_caret_column(5) == 22);
			
			CHECK(text_edit->get_selected_text(0) == "test");
			CHECK(text_edit->get_selected_text(1) == "test");
			CHECK(text_edit->get_selected_text(2) == "test");
			CHECK(text_edit->get_selected_text(3) == "test");
		}
		SUBCASE("[TextEdit] deselect on focus loss") {
			text_edit->set_text("test");
			text_edit->set_deselect_on_focus_loss_enabled(true);