feat: allow tags have its ViewTemplate tag and cascade

[linonetwo]

Title and subtitle and body all have their ViewTemplate tag and cascade, now it's tag's turn.

I will need this to build https://saqimtiaz.github.io/sq-tw/sandbox.html#%24%3A%2Fcore%2Fui%2FViewTemplate%2Ftags that is not shadowing anything.

@pmario @saqimtiaz

[github-actions]

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[linonetwo]

Example usage tiddlers.json

tiddlywiki.zip

[Jermolene]

Thanks @linonetwo I think that the "subtitle" segment is now the only substantive view template segment that does not have a cascade. I think it would be worth giving it a cascade too, in this same PR.

We also need to add the new cascades to the control panel.

[linonetwo]

@Jermolene Updated, with some i18n

[Jermolene]

Thanks @linonetwo

[kookma]

@linonetwo
I highly recommend to follow the same philosophy among Cascades.

So, I propose to add the default template for View Template Tags.

For example, see View Templates Fields, it is like belo:

BUT for View Template Tags, it is empty:

• In other words, the current Tags shall be displayed through a default template
• Users can utilize cascades by employing list-before fields to override the default template.

[linonetwo]

@kookma I copied the code from $:/core/ui/ViewTemplate/body

@Jermolene
Should I delete the :and[!is[blank]else[$:/core/ui/ViewTemplate/body/default]] fallback from $:/core/ui/ViewTemplate/body too? Or is this a defensive programming and is left intended?

[linonetwo]

Updated in #8470

[Jermolene]

Thanks @kookma – I think it is important to match the existing cascades, which means shipping an explicit cascade entry rather than relying on the fallback.

@Jermolene Should I delete the :and[!is[blank]else[$:/core/ui/ViewTemplate/body/default]] fallback from $:/core/ui/ViewTemplate/body too? Or is this a defensive programming and is left intended?

That's correct.