``<tab>``
Move to the next widget (button or text entry field)
-``<backspace>``
+``<backtab>``
Move to the previous widget.
``<return>``
:index:`notmuch-message-headers-visible`
|docstring::notmuch-message-headers-visible|
+:index:`notmuch-show-header-line`
+ |docstring::notmuch-show-header-line|
+
.. _show-copy:
Copy to kill-ring