### 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
ERR_FAIL_INDEX_V(p_caret, carets.size(), -1);
	ERR_FAIL_COND_V(!has_selection(p_caret), -1);
	return carets[p_caret].selection.selecting_line;
}
int TextEdit::get_selection_column(int p_caret) const {
	ERR_FAIL_INDEX_V(p_caret, carets.size(), -1);
	ERR_FAIL_COND_V(!has_selection(p_caret), -1);
	return carets[p_caret].selection.selecting_column;
}
int TextEdit::get_selection_from_line(int p_caret) const {
	ERR_FAIL_INDEX_V(p_caret, carets.size(), -1);
	ERR_FAIL_COND_V(!has_selection(p_caret), -1);
	return carets[p_caret].selection.from_line;
}
int TextEdit::get_selection_from_column(int p_caret) const {