Just reporting back some success for those looking to do this.

Digging into the $:/core/ui/TagTemplate tiddler revealed that what I wanted 
to tweak was in the list-tagged-draggable macrocall. That macro accepts a 
"subFilter" parameter that I could pass my "sortan[]" into.

In investigating further to try to get the section range markings (§§) in 
the right spot, I tried the new sortsub operator. The following 
substitution to the macrocall to list-tagged-draggable works but seems 
rather messy:

<$vars sortsubFilter="[trim[§]splitbefore[ 
]splitbefore[-]trim[-]trim[]addprefix[v]addsuffix[.0]]">
<$macrocall $name="list-tagged-draggable" tag=<<currentTiddler>> 
subFilter="sortsub:version<sortsubFilter>"/>
</$vars>

Two comments:
1) It would be convenient if the "version" modifier to the sortsub operator 
was more tolerant of other types of version strings like #.# or #.#.# 
without the v
2) It seems like there ought to be an equivalent to a splitafter operator 
... or a negation to the splitbefore operator .... that just grabs the 
string *after* the delimiter. Am I missing something? It would have made 
that sortsubFilter easier to enable chopping out the integer after the "." 
and used the "integer" modifier on the sortsub operator and not worried 
about the pickiness of "version".

Is there a simpler way that I am missing? This works but seems rather 
brute-force.

/Mike

On Friday, January 15, 2021 at 10:22:19 AM UTC-4 Michael Wiktowy wrote:

> I'm sorry if this has been asked before but I couldn't find it in the 
> archives ...
>
> I have section headings that are best sorted by sortan[] ... for instance:
>
> Default sort:
> §§417.26-417.100 
> §417.1 
> §417.11 
> §417.13 
> §417.15 
> §417.17 
> §417.19 
> §417.21 
> §417.23 
> §417.25 
> §417.3 
> §417.5 
> §417.7 
> §417.9 
>
> sortan[]
> §§417.26-417.100 
> §417.1 
> §417.3 
> §417.5 
> §417.7 
> §417.9 
> §417.11 
> §417.13 
> §417.15 
> §417.17 
> §417.19 
> §417.21 
> §417.23 
> §417.25 
>
> When these show up in the tag dropdown, they use the default sort. I would 
> like to change this list to use sortan[] by default.
>
> I thought by changing the filters in:
> $:/core/ui/ViewTemplate/tags or
> $:/core/ui/TagTemplate
> to use sortan, it would affect the dropdown list but apparently I am 
> looking at the wrong spot since changing either (and both) doesn't affect 
> the sorting.
>
> Does anyone know where I should be changing the filter sort for the tag 
> dropdown?
>
> /Mike
>

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