### 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
text_edit->set_size(Size2(200, 200));
			text_edit->set_text("this is some text\nfor selection");
			MessageQueue::get_singleton()->flush();
			SIGNAL_DISCARD("caret_changed");
			SEND_GUI_DOUBLE_CLICK(text_edit->get_pos_at_line_column(0, 2), Key::NONE);
			CHECK(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "for");
			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
			CHECK(text_edit->get_selection_from_line() == 1);
			CHECK(text_edit->get_selection_from_column() == 0);
			CHECK(text_edit->get_selection_to_line() == 1);
			CHECK(text_edit->get_selection_to_column() == 3);
			CHECK(text_edit->get_caret_line() == 1);
			CHECK(text_edit->get_caret_column() == 3);
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_pos_at_line_column(0, 7), MouseButtonMask::LEFT, Key::NONE);
			CHECK(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "for selection");
			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
			CHECK(text_edit->get_selection_from_line() == 1);
			CHECK(text_edit->get_selection_from_column() == 0);
			CHECK(text_edit->get_selection_to_line() == 1);
			CHECK(text_edit->get_selection_to_column() == 13);
			CHECK(text_edit->get_caret_line() == 1);
			CHECK(text_edit->get_caret_column() == 13);
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			Point2i line_0 = text_edit->get_pos_at_line_column(0, 0);
			line_0.y /= 2;
			SEND_GUI_MOUSE_BUTTON_EVENT(line_0, MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
			CHECK_FALSE(text_edit->has_selection());