### 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
SIGNAL_CHECK("caret_changed", empty_signal_args);
			text_edit->set_selecting_enabled(false);
			text_edit->select_word_under_caret();
			CHECK_FALSE(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "");
			CHECK(text_edit->get_caret_line(0) == 1);
			CHECK(text_edit->get_caret_column(0) == 4);
			CHECK(text_edit->get_caret_line(1) == 2);
			CHECK(text_edit->get_caret_column(1) == 4);
			SIGNAL_CHECK_FALSE("caret_changed");
			text_edit->set_selecting_enabled(true);
			text_edit->set_caret_line(1, false, true, 0, 0);
			text_edit->set_caret_column(5, false, 0);
			text_edit->set_caret_line(2, false, true, 0, 1);
			text_edit->set_caret_column(5, false, 1);
			text_edit->select_word_under_caret();
			CHECK_FALSE(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "");
			text_edit->select_word_under_caret();
			CHECK_FALSE(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "");
			CHECK(text_edit->get_caret_line(0) == 1);
			CHECK(text_edit->get_caret_column(0) == 5);
			CHECK(text_edit->get_caret_line(1) == 2);
			CHECK(text_edit->get_caret_column(1) == 5);
			SIGNAL_CHECK_FALSE("caret_changed");
		}
		SUBCASE("[TextEdit] add selection for next occurrence") {
			text_edit->set_text("\ntest   other_test\nrandom   test\nword test word nonrandom");
			text_edit->set_caret_column(0);