Dangerous space bar key (was: Preventing the user shooting themself in the foot)

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+From: Matthieu Lemerre <racin@free.fr>\r
+To: Robin Green <greenrd@greenrd.org>, Notmuch Mail <notmuch@notmuchmail.org>\r
+Subject: Dangerous space bar key (was: Preventing the user shooting themself\r
+       in the foot)\r
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+References: <86iproe86u.fsf@greenrd.plus.com>\r
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+Date: Mon, 04 Jul 2011 23:36:35 +0200\r
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+\r
+On Wed, 29 Jun 2011 20:42:01 +0100, Robin Green <greenrd@greenrd.org> wrote:\r
+> It's really dangerous to use the 'a' key in notmuch-mode in an inbox\r
+> thread which has multiple unread replies! Yes, the other unread replies\r
+> will still be tagged unread, but the user might not immediately be aware\r
+> of them. It would be really useful to have an optional warning ("More\r
+> unread messages in this thread, are you sure?") for this situation!\r
+\r
+I take advantage of this thread to tell about another dangerous\r
+situation I've found related to the use of the space key in show mode.\r
+\r
+I like to use the space (and sometimes the backspace key) to read\r
+threads back and forth, but sometimes I might read stuff to quickly and\r
+archive a thread without wanting it. It is then complex to find it back\r
+(especially if the thread contained a single message and I hit space\r
+before actually reading the message, so I can't find it again).\r
+\r
+As a workaround, I have changed the space key function\r
+"notmuch-show-advance-and-archive" to not archive the thread if we are\r
+at the end of the thread, but to just do nothing. Thus I have to\r
+expicitely archive the thread when I have finished reading it, which I\r
+find much safer.\r
+\r
+I think the "and-archive" part of the space bar key should be at least\r
+configurable. The patch is pretty simple but I can provide it if needed.\r
+\r
+Note: The n and p keys are not good replacement for space/backspace.\r
+First, because they do not remove the 'read' tag. Second, when you are\r
+in the middle of a message, the p key go to the previous message instead\r
+of going on top of the current one. (Actually, the behaviour of n is\r
+fine, only p is annoying me). I think this is inconsistent with what\r
+others mode do (e.g. C-M-u in programming modes, or C-c C-p in\r
+org-mode), and the p key when in a message should go to the beginning of\r
+the current message.\r
+\r
+Matthieu\r