Expanding a conversation in the message list (row click, expand chevron,
or the `x` shortcut) and clicking a row in a Pro folder tab marked the
messages read straight away. They ignored "Mark as read: Never" and any
delay, which the reading pane and the conversation view follow.
Route them through one helper, scheduleAutoMarkAsRead: -1 never marks,
0 marks at once, any other value marks after that many milliseconds and
returns a cancel function.
- New store action autoMarkExpandedThreadAsRead keeps one pending timer
per thread key. Collapsing the thread, or collapsing all threads, drops
it. Both expansion paths (EmailList and the `x` handler in MailApp) use
it.
- MailApp's handleEmailSelect drops the pending mark of every expanded
thread other than the one the newly opened message belongs to, through
cancelAutoMarkThreadAsRead. Moving on with `j`/`k` or a click no longer
lets the delayed mark land on a conversation the user has left. The
thread stays expanded.
- ProFolderTabBody schedules the row mark through the helper and drops a
pending one when another row is opened or the tab unmounts.
Linus Rath
VasilisNtovolos
Peterka35
lucamzanon