A "Live"-filtering function

[Coldblackice]

Checklist

• [X] I understand that Streamlink Twitch GUI is just a launcher for Streamlink
• [X] I have read the contribution guidelines
• [X] I have checked the list of open and recently closed issues
• [X] I have checked the commit log of the master branch

Description

A "Filter" function would be extremely useful if possible, either in place of "Search" on "Followed" tabs, or even as a separate app-wide box beside or below "Search". Typing in the filter box would instantly hide any streams/channels on page that don't match the terms.

This usefulness could go even further with a "negation" modifier, e.g. by adding a "!" or "-" in front of a filter term, any channels/stream containing that term are temp-hidden, whether a channel|stream|category (most useful) name. For example, typing "!Elden !Chatting" would temp-hide all streams on page playing "Elden Ring" or streaming "Just Chatting".

This would provide a fast and easy way of quickly honing in on a particular stream/channel rather than visually combing through a grid of thumbnails or doing a Twitch-wide search. I'll sometimes forget the exact name of a channel I follow, and being able to type a word from it and seeing it leftover on page, even if a few other channels/streams are leftover, would be great.

Regardless, this is a sleek, phenomenally useful program as is. Its functionality and customization options (even a per-channel level!) are fantastic and well thought out. Awesome job!