Negative search doesn't work properly

[wrvsrx]

Description

Negative search works incorrectly when search starts with a negative search.

Reproduce

1. Create a small repo with only one note

   ---
   title: duw
   tags: [test]
   ---
   There is no content

2. Type -content in search box

3. The note appears in search result.

Analysis

However, typing duw -content in search box works correctly. It seems that this bug only happens when a search starts with a negative search.