We can't fit all the authors and the various changed subjects in 80
columns, but it would be great is isearch could still find these, (and
automatically expand the hidden content as necessary).
Add a binding to open all closed messages.
+Make all authors and subjects available to isearch, (hidden by default
+but with magic expansion while isearching).
+
Emacs saved-search interface
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Here's a proposal Carl wrote (id:87einafy4u.fsf@yoom.home.cworth.org):