### 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(text_edit->get_version() == 0);
	CHECK(text_edit->get_saved_version() == 0);
	text_edit->begin_complex_operation();
	text_edit->begin_complex_operation();
	text_edit->begin_complex_operation();
	text_edit->insert_text_at_caret("test");
	CHECK(text_edit->get_version() == 1);
	CHECK(text_edit->get_saved_version() == 0);
	CHECK(text_edit->has_undo());
	CHECK_FALSE(text_edit->has_redo());
	text_edit->end_complex_operation();
	
	text_edit->insert_text_at_caret(" nested");
	CHECK(text_edit->get_version() == 2);
	CHECK(text_edit->get_saved_version() == 0);
	CHECK(text_edit->has_undo());
	CHECK_FALSE(text_edit->has_redo());
	text_edit->undo();
	CHECK(text_edit->has_redo());
	text_edit->redo();
	text_edit->end_complex_operation();
	text_edit->insert_text_at_caret(" ops");
	CHECK(text_edit->get_version() == 3);
	CHECK(text_edit->get_saved_version() == 0);
	CHECK(text_edit->has_undo());
	CHECK_FALSE(text_edit->has_redo());
	text_edit->end_complex_operation();
	text_edit->tag_saved_version();
	CHECK(text_edit->get_saved_version() == 3);
	text_edit->undo();