[Issue 24858] New: maxIndex but not minIndex sometimes returns the index as an array with a single element

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24858

          Issue ID: 24858
           Summary: maxIndex but not minIndex sometimes returns the index
                    as an array with a single element
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: pabuond at gmail.com

`maxIndex` returns an array with a single element when run on an array modified
by UFCS (e.g. for absolute value). `minIndex` doesn't, so I guess this is a
bug.
Tested with dmd v2.109.1

```
import std.math: fabs;
import std.algorithm: minIndex, maxIndex;

double[] u = [-9, 3, 2, 8, 4];
writeln(u.maxIndex); // => 3, OK
writeln(u.map!fabs.minIndex); // => 2, OK
writeln(u.map!fabs.maxIndex); // => [0] ??? Expected: 0
```
Thanks!

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