Be careful using the field filter operator with a text reference or
variable as parameter, if they are not defined or empty, it is the same as
calling it with an empty parameter.
Try the following on empty.html:
[modifier{$:/status/UserName}]
if {$:/status/UserName} is non existent or blank, what you get is every
tiddler where this field doesn't exist or is blank.
See https://tiddlywiki.com/#field%20Operator
If S is empty, field will match both of the following:
>
> - tiddlers that don't contain field F
>
>
> - tiddlers in which field F exists but has an empty value
>
>
On Friday, June 5, 2020 at 6:47:37 AM UTC+2, TonyM wrote:
>
> Saq,
>
> I did it once again, and it *did not reoccur*, however I have realised I
> often use a bookmarklet as my first step in any "new" or online wiki.
>
> Although my suggestion to make a filter such as below and allowing other
> plugins to register exclusions.
> [haschanged[]] -[prefix[$:/temp]] -[prefix[$:/state]] -$:/StoryList -$:/
> HistoryList -[prefix[$:/Bob]] -[prefix[$:/ServerIP]] -[prefix[$:/
> WikiSettings]]
>
>
> The bookmarklet was defined with the following filter, ie items changes at
> the time it was made, the listed tiddler should not be in it, but they seem
> to appear after the install.
>
> [all[]modifier{$:/status/UserName}!prefix[$:/temp]!prefix[$:/state]] -[[$
> :/HistoryList]] -[[$:/StoryList]] -[[$:/PSaT/bookmarkletMaker/
> AdvancedSearch]]
>
>
> And while this list does not change the haschanged tiddlers I think it may
> be changing one of the subtiddlers.
>
> I will need to follow this lead further.
>
> Thanks
> Tony
>
>
>
>
> On Friday, June 5, 2020 at 2:20:23 PM UTC+10, Saq Imtiaz wrote:
>>
>> @Tony what browser and OS are you using?
>>
>> Running the filter [haschanged[]] at https://tiddlywiki.com/empty.html in
>> Linux and the latest Chrome gives me the following:
>>
>> $:/StoryList
>> $:/HistoryList
>> $:/state/tab--1498284803
>> $:/temp/advancedsearch
>>
>>
>>
>> On Friday, June 5, 2020 at 5:57:22 AM UTC+2, TonyM wrote:
>>>
>>> Folks,
>>>
>>> Some of you would be aware I have had a few problems of late with
>>> upgrading tiddlywiki. The solution was to get rid of some overwitten shadow
>>> tiddlers.
>>>
>>> I had no idea how this had occurred. But suspect I do now.
>>>
>>> However I just noted this;
>>>
>>> In a new empty.html use the advanced search filter [haschanged[]] and
>>> this is the result
>>>
>>>
>>> - *$:/library/sjcl.js*
>>> - *$:/boot/bootprefix.js*
>>> - *$:/boot/boot.js*
>>> - *$:/boot/boot.css*
>>> - *$:/core*
>>> - *$:/isEncrypted*
>>> - *$:/themes/tiddlywiki/snowwhite*
>>> - *$:/themes/tiddlywiki/vanilla*
>>> - *$:/temp/info-plugin*
>>> - *$:/status/RequireReloadDueToPluginChange*
>>> - *$:/StoryList*
>>> - *$:/HistoryList*
>>> - *$:/state/tab--1498284803*
>>> - $:/temp/advancedsearch
>>>
>>>
>>> *Are most of these not "false positives"?*
>>>
>>> *Now I must ask the question why are all these flagged as has changed?,*
>>> especially since many are shadow tiddlers only, or plugins such as core?
>>>
>>> Note: I regularly exclude with -[prefix[$:/temp]] -[prefix[$:/state]]
>>> -$:/StoryList -$:/HistoryList
>>>
>>> I have used the has changed filter to export and re-import tiddlers when
>>> my server or saver has failed in someway, clearly if I do this I import and
>>> overwrite these tiddlers, a subsequent upgrade will keep them, and seems to
>>> throw errors and the resulting wiki may be broken.
>>>
>>> I also discovered on bob I need to exclude the following or I will also
>>> may be in grief;
>>>
>>>
>>> - -[prefix[$:/Bob]]
>>> - -[prefix[$:/ServerIP]]
>>> - -[prefix[$:/WikiSettings]]
>>>
>>> Now I understand these bob tiddlers may need to change.
>>>
>>> *However*
>>> In all wikis you can see using the haschanged operator to escape
>>> problems with the saving mechanisium is asking from trouble.
>>>
>>> Perhaps;
>>> We could add a filter that does not list haschanges that are not as
>>> above and allows plugins such as bob to register tiddlers that should not
>>> be considered when trying to export changes. Excluding system tiddlers is
>>> not enough if someone is editing system tiddlers even just configuration
>>> tiddlers.
>>>
>>> The following would work if these false positives where not occurring.
>>>
>>> [haschanged[]] -[prefix[$:/temp]] -[prefix[$:/state]] -$:/StoryList
>>> -$:/HistoryList -[prefix[$:/Bob]] -[prefix[$:/ServerIP]]
>>> -[prefix[$:/WikiSettings]]
>>>
>>>
>>> Regards
>>> Tony
>>>
>>>
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