Scaled avatar used for typing notifications could use normal size image

[tdaede]

Description

On hidpi (but probably normal dpi too) the user avatars are 64x64 for messages, however for typing indicators they are 48x48. These turn into special GET requests to get resized images, however this means that there's a delay as the 48x48 typing indicator is loaded. In practice the 64x64 one will almost always be loaded (or will need to be loaded very soon) so this could simply always use the 64x64 asset (scaled down by the browser).

Steps to reproduce

Load a channel where someone has sent a message, then have them start typing.

Logs being sent: yes/no

Version information

• Platform: web

For the web app:

• Browser: Firefox 74
• URL: v1.5.7-100-g9ee7febd

[t3chguy]

Good point, this falls into two issues

The requested image should be 2x/3x bigger than the render size for hidpi/zooming and also should be binned so that we deduplicate requests