- `0` means pages at the same level as the given prefix
- `1` means one level deeper than the given prefix (etc. for higher numbers)
- `-1` means any depth
Examples:
{{{
[[TitleIndex(PageTemplates/, depth=0)]]
}}}
This will list the immediate children of PageTemplates (note that "/" was part of the prefix).
{{{
[[TitleIndex(PageTemplates, depth=1)]]
}}}
This will list the immediate children of PageTemplates and PageTemplates itself.
Implements #4653.
