Feature Request: Tag hierarchy

[admbeck]

Is your feature request related to a problem? Please describe.
Often images are tagged inconsistently by the people in boorus since it's difficult to keep in mind all the tags that are related, but can't be considered an alias for each other.

Describe the solution you'd like
In order to streamline the process of both manual tagging and importing, it would be useful to define hierarchy for tags similarly to the feature found in stashapp.

• Definition of parent/child tags in a separate menu
• Automatic addition of parent tags to the image if they weren't explicitly defined

Additional context
Practical example after parent/child relationships were defined by user:

• "holding_spear" automatically adds "holding, spear, polearm, holding_polearm, weapon"
• "argonian" automatically adds "scalie, anthro, the_elder_scrolls, farming_equipment"

[resucutie]

I don't want to add tag hierarchy, as it'll increase the complexity

But, I am up for tag groups, where you input group:holding_spear and it'll be the same as adding holding spear polearm holding_polearm weapon

I also have to redesign how tag modifiers will affect it. Would, for example, typing -group:holding_spear end up with -holding -spear -polearm -holding_polearm -weapon ?
Honestly, for that one, adding a new grouping syntax (smth like bee -[cuddles hug]) sounds like the best to fix that up