### 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
#endif
			CHECK(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "test");
			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT)
			CHECK(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "tes");
#ifdef MACOS_ENABLED
			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT | KeyModifierMask::ALT)
#else
			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT | KeyModifierMask::CMD_OR_CTRL)
#endif
			CHECK_FALSE(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "");
			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::SHIFT)
			CHECK(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "t");
			SEND_GUI_KEY_EVENT(Key::RIGHT)
			CHECK_FALSE(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "");
			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT)
			CHECK(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "t");
			SEND_GUI_KEY_EVENT(Key::LEFT)
			CHECK_FALSE(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "");
			text_edit->set_selecting_enabled(false);
			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::SHIFT)
			CHECK_FALSE(text_edit->has_selection());
			CHECK(text_edit->get_selected_text() == "");
			text_edit->set_selecting_enabled(true);