feat: (Tumblr): A mutuals checker patch.

[VonSparq]

Feature description

By default Tumblr labels your mutuals (users who you follow and they follow you back) only in a few select places, this feature would allow you to see if the user is your mutual whenever their username appears which is really cute and useful.

Motivation

It is really useful on Tumblr to see if a user is your mutual or not, some people have a lot of account they follow and it's cool to know if they follow you back at a glance. This feature would allow you to easily see it whenever you see another user's username. This feature already exists in the desktop browser extension for Tumblr, XKit Rewritten which is open source and also uses GPL-3.0 so you might be able to take a look how they implemented it which might make writing the patch easier. I think this would be a very cool and great feature to implement because it's nice to see if you are mutuals with other tumblr users, it's not a very crucial or groundbreaking feature but I think it would be awesome if you could add it!

Acknowledgements

• [X] This issue is not a duplicate of an existing feature request.
• [X] I have chosen an appropriate title.
• [X] All requested information has been provided properly.

[oSumAtrIX]

Why is it likely to see a mutual in the app when using it?

[VonSparq]

Mutuals are very important and precious in Tumblr culture, you follow them and they follow you, it's kinda like friends on other apps. It's a cool thing to see that a friend is sharing something and not just a random account you follow. You can have multiple blogs on tumblr, people can change their blog's names and you often follow loads of blogs so it's not always a given you remember everyone you're mutuals with by their blog's name, so this feature helps you to see at a glance which posts are made by people you care about and if you kinda remember that person it's a way to see that they're important and you can open their profile and check what you know them from. Like I said it's not the most crucial feature to implement, it's a feature that's really nice to have on desktop and I think would make a great little addition to the app!