notmuch.el: controlling what does and doesn't get expanded in searches

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+ Thu, 04 Aug 2016 08:54:16 -0700 (PDT)\r
+From: Matt Armstrong <marmstrong@google.com>\r
+To: notmuch@notmuchmail.org\r
+Subject: notmuch.el: controlling what does and doesn't get expanded in\r
+ searches\r
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+Date: Thu, 04 Aug 2016 08:54:14 -0700\r
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+\r
+This question pertains to notmuch built from recent git HEAD, using\r
+notmuch.el in show mode (i.e. not tree mode).\r
+\r
+I sometimes read a thread with a bunch of messages and notmuch.el\r
+collapses a bunch of them (even if unread and the search matches tags in\r
+every message).  I can't figure out the heuristic notmuch is applying\r
+here.  In particular, pressing SPC does not seem to navigate to the\r
+collapsed messages (again, even if they are unread).\r
+\r
+Worst case: only the first messages is initially expanded and all\r
+subsequent are collapsed.  I press SPC and the cursor goes to the end of\r
+search results.  SPC again all the entire thread is archived.\r
+\r
+This behavior has caused me to accidentally skip messages.  First step\r
+for me is understanding what is going on so I can fix it.\r