This makes `show-trailing-whitespace' happy, i.e. it does not mark the
whole search box line as trailing spaces.
Since the dot is invisible, this change makes no visible difference
for `notmuch-hello'.
Edited-by: Pieter Praet <pieter@praet.org> to fix the tests.
One is quoted printable, the other users 8 bit encoding. The latter
triggers a bug in the python bindings due to missing call to
g_mime_init. The corresponding test is marked broken in this commit.
It is very convenient when C-e (bound to `widget-end-of-line') ignores
trailing spaces inside the search widget. But it only does so if a
widget is not followed by a newline (that is why it works in the saved
search widgets). The patch just adds an invisible space after the
search widget to get the desirable behavior of `widget-end-of-line'.
The extra space is also added to expected results of emacs tests.
