Saq, this makes good sense, but then why does " links" work?

On Saturday, January 16, 2021 at 2:50:05 PM UTC-6 Soren Bjornstad wrote:

> Sorry, I guess I was trying to simplify it and forgot to re-test my 
> simplified example. Here's one with a space that does return results:
>
> [!is[system] links[]]
>
> On Saturday, January 16, 2021 at 2:39:55 PM UTC-6 Mark S. wrote:
>
>> When I tried this, I got no output for either filter:
>>
>> <$list filter="[!is[system] tag[MyTag]]" emptyMessage="Nothing #1"/>
>>
>> <$list filter="[contains:bibliography[xyz] is[tiddler]]" 
>> emptyMessage="Nothing #2" />
>>
>> output:
>>
>> Nothing #1
>>
>> Nothing #2
>>
>> On Saturday, January 16, 2021 at 9:10:45 AM UTC-8 Soren Bjornstad wrote:
>>
>>> Hi all,
>>>
>>> I know this filter is incorrect, as spaces are only allowed in between 
>>> filter runs, not between filter steps:
>>>
>>> [!is[system] tag[MyTag]]
>>>
>>> However, I haven't been able to figure out what exactly TiddlyWiki *does 
>>> *when you insert a space in between filter steps. There is no error; 
>>> instead it tries to do *something* with the filter you provided. But I 
>>> can't figure out what that is.
>>>
>>> In the example above, the output is the same as just "[!is[system]]", so 
>>> my hypothesis was that everything after the space is ignored. But I quickly 
>>> ran across counterexamples, like this one:
>>>
>>> [contains:bibliography[xyz] is[tiddler]]
>>>
>>> This never returns *any* results, as far as I can tell, even though 
>>> either step alone would return many results.
>>>
>>> Is there any clear pattern for what happens, or should I just say that 
>>> the result is undefined 
>>> <https://en.wikipedia.org/wiki/Undefined_behavior> if you put a space 
>>> there?
>>>
>>>

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