[notmuch] strange behavior of indexing of and searching for strings containing '[]'

[Jameson Rollins]

Hey, folks.  I've been noticing some strange behavior of notmuch search
results for strings containing '[]'.  Here are some searches for some
exact strings in messages subjects:

servo:~ 0$ notmuch search subject:'emacs paned UI'
thread:533da424197bb6ba61a42b667d5d8d8f   Wed. 14:12 [2/2] Tad Fisher, Jameson Rollins; [notmuch] Emacs paned UI ()
servo:~ 0$ 

So that's fine and expected.  This however is not:

servo:~ 0$ notmuch search subject:'[notmuch] emacs paned UI'
thread:5f2cb4b108773a39161b33c86e54f7fd  4 mins. ago [1/1] Jameson Rollins; [notmuch] loss of duplicate messages (inbox)
servo:~ 0$ 

Not only did it not turn up the message that *does* match that exact
string in it's subject line, it actually turns up a completely different
message that doesn't match the search term at all!

This search actually turns up both:

servo:~ 0$ notmuch search subject:'notmuch emacs paned UI'
thread:5f2cb4b108773a39161b33c86e54f7fd  5 mins. ago [1/1] Jameson Rollins; [notmuch] loss of duplicate messages (inbox)
thread:533da424197bb6ba61a42b667d5d8d8f   Wed. 14:12 [2/2] Tad Fisher, Jameson Rollins; [notmuch] Emacs paned UI ()
servo:~ 0$ 

Which is again strange, because the second message does not at all match
that search term.

Does anyone have any idea what's going on here?  I think I saw mention
of this issue on IRC somewhere, but I thought I should bring it up
explicitly here.  This is definitely some buggy behavior.

jamie.
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