The bulk actions menu for topics has multiple options to work
with tags on topics (append, replace, remove). Our tagging system
along with categories allows for some complicated tag restrictions
to be applied via tag groups. This was a problem for the topic bulk
actions because you couldn't append restricted tags to topics.
This commit allows restricted tags to be used in bulk tagging actions
as long as all selected topics are for a sole category. The category
information will be shown in the modal, and the category ID is used
for the tag search.
* A11Y: Update bulk selection keyboard shortcuts
Still a draft, but in current state this:
- adds `shift+b` as a keyboard shortcut to toggle bulk select
- adds `shift+d` as a keyboard shortcut to dismiss selected topic(s) (this
replaces `x r` and `x t` shortcuts)
- adds `x` as a keyboard shortcut to toggle selection (while in bulk select mode)
- fixes a bug with the `shift+a` shortcut, which was not working properly
Note that there is a breaking change here. Previously we had:
- `x r` to dismiss new topics
- `x t` to dismiss unread topics
However, this meant that we couldn't use `x` for selection, because the
itsatrap library does not allow the same character to be used both as a
single character shortcut and as the start of a sequence. The proposed
solution here is more consistent with other apps (Gmail, Github) that use
`x` to toggle selection.
Also, we never show both "Dismiss New" and "Dismiss Unread" in the same
screen, hence it makes sense to consolidate both actions under `shift+d`.
* Address review
