Clicking on a search result triggers a hard reload

Created by: eseliger

• Sourcegraph version: Sourcegraph.com
• Platform information: macOS 10.15.4, Chrome 81

Steps to reproduce:

1. Search for https://sourcegraph.com/search?q=repo:%5Egithub%5C.com/sourcegraph/sourcegraph%24+&patternType=literal
2. Click the repo result

Expected behavior:

Should be an SPA and just go to the repo page

Actual behavior:

It reloads the whole page