### 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->end_complex_operation();
			((Array)lines_edited_args[0])[1] = 2;
			((Array)lines_edited_args[1])[1] = 0;
			
			SEND_GUI_ACTION("ui_text_backspace_word");
			CHECK(text_edit->get_viewport()->is_input_handled());
			CHECK(text_edit->get_text() == " is some test text.\n is some test text.");
			CHECK(text_edit->get_caret_line() == 0);
			CHECK(text_edit->get_caret_column() == 0);
			CHECK_FALSE(text_edit->has_selection(0));
			CHECK(text_edit->get_caret_line(1) == 1);
			CHECK(text_edit->get_caret_column(1) == 0);
			CHECK_FALSE(text_edit->has_selection(1));
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			SIGNAL_CHECK("text_changed", empty_signal_args);
			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
			text_edit->set_editable(false);
			SEND_GUI_ACTION("ui_text_backspace_word");
			CHECK(text_edit->get_viewport()->is_input_handled());
			CHECK(text_edit->get_text() == " is some test text.\n is some test text.");
			CHECK(text_edit->get_caret_line() == 0);
			CHECK(text_edit->get_caret_column() == 0);
			CHECK_FALSE(text_edit->has_selection(0));
			CHECK(text_edit->get_caret_line(1) == 1);
			CHECK(text_edit->get_caret_column(1) == 0);
			CHECK_FALSE(text_edit->has_selection(1));
			SIGNAL_CHECK_FALSE("caret_changed");
			SIGNAL_CHECK_FALSE("text_changed");
			SIGNAL_CHECK_FALSE("lines_edited_from");
			text_edit->set_editable(true);