@Jeremy
Many thanks for the clarification! I got the point!
Actually, it was Tiddler Commander test, I realized I cannot do operation 
as I do on real tiddler.

@Tony
Thanks Tony! The +[!is[missing]] was the second expression.

Best
Mohammad


On Saturday, March 23, 2019 at 3:45:25 PM UTC+4:30, Jeremy Ruston wrote:
>
> Hi Mohammad 
>
> > Why shadow toddlers are missing tiddlers? 
>
> Because shadow tiddlers aren’t stored as “real” tiddlers. They are 
> intentionally excluded from most operations by default so that they don’t 
> clutter filters made by users unless explicitly required. 
>
> > By accident I realised a filter output of shadows when fed the 
> +[!is[missing]] return empty output, why? 
>
> In this example, we obtain the titles of all the shadow tiddlers in the 
> $:/core plugin, and then select those that are not missing i.e. the ones 
> that exist as “real” tiddlers because they have been overridden: 
>
> [[$:/core]plugintiddlers[]!is[missing]] 
>
> Best wishes 
>
> Jeremy 
>
>
> > 
> > Mohammad 
> > 
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