### 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_FALSE(text_edit->has_selection(1));
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			SIGNAL_CHECK_FALSE("text_changed");
			SIGNAL_CHECK_FALSE("lines_edited_from");
		}
		SUBCASE("[TextEdit] ui_text_caret_right") {
			text_edit->set_text("this is some test text\n\nthis is some test text\n");
			text_edit->set_caret_line(0);
			text_edit->set_caret_column(16);
			text_edit->select(0, 16, 0, 20);
			text_edit->add_caret(2, 16);
			text_edit->select(2, 16, 2, 20, 1);
			CHECK(text_edit->get_caret_count() == 2);
			MessageQueue::get_singleton()->flush();
			SIGNAL_DISCARD("text_set");
			SIGNAL_DISCARD("text_changed");
			SIGNAL_DISCARD("lines_edited_from");
			SIGNAL_DISCARD("caret_changed");
			
			SEND_GUI_ACTION("ui_text_caret_right");
			CHECK(text_edit->get_viewport()->is_input_handled());
			CHECK(text_edit->get_caret_line() == 0);
			CHECK(text_edit->get_caret_column() == 20);
			CHECK_FALSE(text_edit->has_selection(0));
			CHECK(text_edit->get_caret_line(1) == 2);
			CHECK(text_edit->get_caret_column(1) == 20);
			CHECK_FALSE(text_edit->has_selection(1));
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			SIGNAL_CHECK_FALSE("text_changed");
			SIGNAL_CHECK_FALSE("lines_edited_from");