'matrix in group' test doesn't work

<div id="comment:0"></div>

The code 



```
G = SL(2,ZZ)                 
M = matrix([[1,0],[0,1]])    
M in G            
```


runs possibly forever inside GAP. same for

```
M = matrix(ZZ,[[1,0],[0,1]])
```

Component: **group theory**

_Issue created by migration from https://trac.sagemath.org/ticket/1646_

