Don't create disposable from operation of storing search to history
because we certainly want this to complete. But create disposable
from subscriber functions which handles showing snackbar notifiying
user about not being to save search
Disposable was created in `search` method and then alsmost immediately
was called `startLoading` which disposed "all" disposables including
our operation of search storing (if it was unlucky enough to not finish
before this moment)
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