Add jump to unread banner message

[k3vmcd]

Description

When there are unread messages in a conversation, viewing the room opens to the most recent message and there is not an easy way to start from the last unread position instead.

Steps to reproduce

• Participate in a room
• Deselect room and wait until there are enough unread messages to cause the last unread position to be off-screen)
• Select room to read messages

Actual result: Room is loaded to most recent message and unread badge clears. There is no way to jump to the last read message and begin reading in chronological order.
Expected result: There is a persistent, manually dismissible banner that says "X Unread Messages" and when the user clicks on the banner it jumps to the last read message. (Alternate behavior: The room always loads to the last read message and the user scrolls chronologically to the most recent message).

[ara4n]

i think this is probably a dup of #1146?

[k3vmcd]

Hmm, I didn't realize it would show up eventually if the user scrolls up. If there is already a banner that behaves as outlined above, then yes this is a dup of #1146 as it's just a display bug.

[MightyCreak]

i think this is probably a dup of #1146?

I'm not sure I understand what #1146 tries to fix... but I sure agreed with this one here.

Also I think the unread banner should stay way longer than the few seconds we have currently. I often don't even have the time to see it, it's already gone.

[richvdh]

dup #1146