### 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
SUBCASE("[TextEdit] select all") {
			text_edit->select_all();
			CHECK_FALSE(text_edit->has_selection());
			ERR_PRINT_OFF;
			CHECK(text_edit->get_selection_from_line() == -1);
			CHECK(text_edit->get_selection_from_column() == -1);
			CHECK(text_edit->get_selection_to_line() == -1);
			CHECK(text_edit->get_selection_to_column() == -1);
			CHECK(text_edit->get_selected_text() == "");
			ERR_PRINT_ON;
			text_edit->set_text("test\nselection");
			SEND_GUI_ACTION("ui_text_select_all");
			CHECK(text_edit->get_viewport()->is_input_handled());
			MessageQueue::get_singleton()->flush();
			CHECK(text_edit->get_selected_text() == "test\nselection");
			CHECK(text_edit->has_selection());
			CHECK(text_edit->get_selection_from_line() == 0);
			CHECK(text_edit->get_selection_from_column() == 0);
			CHECK(text_edit->get_selection_to_line() == 1);
			CHECK(text_edit->get_selection_to_column() == 9);
			CHECK(text_edit->get_selection_mode() == TextEdit::SelectionMode::SELECTION_MODE_SHIFT);
			CHECK(text_edit->get_caret_line() == 1);
			CHECK(text_edit->get_caret_column() == 9);
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			text_edit->set_caret_line(0);
			text_edit->set_caret_column(0);
			text_edit->set_selecting_enabled(false);
			CHECK_FALSE(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "");
			CHECK(text_edit->get_caret_line() == 0);