Would it be possible to support mailboxes with spaces (and/or some syntactic sugar to not have to type "notmuch://?query=" all the time)?
There are a couple solutions within your control. You can rebind the editor menu <buffy-cycle> function to another key (or to noop): it defaults to space. Alternatively, you can invoke <quote-char>, which defaults to control-v, before each space character.
-Kevin
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