Issue 7669: '/' keyboard shortcut puts a '/' in the search box

Affected Version: 404.0

What steps will reproduce the problem?
1. Load https://gerrit-review.googlesource.com/c/gerrit/+/138794 in a fresh browser
2. Click somewhere in the whitespace below the commit message.
3. Press '/'

What is the expected output?
Search box is focused but empty.

What do you see instead?
Search box is focused but contains '/'

Please provide any additional information below.
This only happens the first time after page load. Deleting the character, clicking to unfocus the search box, and pressing '/' again works correctly.