Fixes https://github.com/vector-im/riot-web/issues/3383
This achieves the result by counting up the number of highlights across all rooms and setting that as the badge above the icon. If there are no highlights, nothing is displayed. The red highlight on the bell is done by abusing how the Tinter works: because it has access to the properties of the SVG that we'd need to override it, we give it a collection of colors it should use instead of the theme/tint it is trying to apply. This results in the Tinter using our warning color instead of whatever it was going to apply.
The RightPanel now listens for events to update the count too, otherwise when the user receives a ping they'd have to switch rooms to see the change.
With this more of the
controls that look like buttons can be operated via the keyboard and
navigated to by screen reader users. This includes editor buttons such
as File upload, Audio / Video call, Right pannel hide button, Jump to
the bottom timeline button, and some more buttons found in the user
settings.
Also I have added alt texts to some images that in turn label buttons
which these happen to be packed in and removed some untranslated alt
texts from decorative non-actionable images that might add more
verbosity when talking about screen reader user experience.
Take a step closer to a flux-like architecture for group data, for
the purposes of providing features that require it.
Now the app has a single GroupStore that can be poked to fetch
updates for a particular group.
Travis Ralston