Room header buttons mix global and room-specific functionality

[chagai95]

Description

It's not logical to have both of these in the same place - entangled in the same area. This causes confusion and users do not know where to look for things.

The video and audio call buttons are room specific just like the info button and partially the search button (also the hide widget and message pinning) this gives the user the feeling that also the notifications bell button is room specific.

The most important fact though is the search all messages, this is very well hidden and has to be navigated to by going to by going to a room (yes I know users are 99% of the time in a room, but there are some cases where they are not e.g. #/home) and then switching from "This Room" to "All Rooms" which basically renders this useless for normal users.

Suggestions:

1. Replace the filter room with a general search which will also filter rooms.
2. add a search all messages button in #/home

and replace the "Explore rooms" button with a home button (this will also make the web logic more similar to mobile)

3. The general search could be placed above the other room specific icons, which will also make room for other future non room specific functionality (for example a calendar), this will also solve where to put the Notifications bell button.

This is how Telegram does it:

2021-05-21.17-46-02.mp4

If you think I'm wrong and this is not a bug I'll move this to feature request, but it seems like a bug to me...

[t3chguy]

Closing in favour of #20614