Don't show expansion if result is the same #34
Description
In some cases, we show that there is possible expansion, but he result then is the same as before.
For example, in the next case, the expansions return the same - except for -128 that becomes -(128) (but could also not be expanded.
This can mislead the users to think that they will get an expansion when the result is the same.
Before expansion:
After expansion:
