Spinoff of bug 169372 Mark All Read should work only on visible messages in the view. A change is coming down the pike for this to be changed/remedied in the QuickSearch view (bug 169372), but views other than QuickSearch will need separate fix. Current behavior: 1. Newsgroup has unread messages, some of the unread are in Watched threads. 2. Switch view to Watched Threads with Unread. 3. Ctrl+Shift+C or Mark All Read. Current result: All messages in the group, whether in the Watched view or not, are marked read. Suggested result: Only the messages in the Watched view would be marked read.

I like to Shift+Cmd+C to clear the unread count after looking through a 'group when bug 192903 has bitten. But I guess we ought to have three commands here: - Mark Newsgroup Read - clear the unread count, including any headers not downloaded but included in the current message count - Mark All Read - mark all downloaded headers in the 'group as read (would need a new name to prevent confusion and consequential dataloss, and could do with a new shortcut key) - Mark Visible Read

The way this currently works is it marks all messages in a folder read. Not just the visable messages. This is a problem is when you have a folder with thousands of messages in it it puts a heavy load on the server trying to process all those messages.

Why should it communicate with the server at all in order to mark messages as read?

for imap, messages are marked read on the server.

In thunderbird maill and news, this operates only on messages in the view/thread pane. Is it not the same for Seamonkey?