Fuzzy finder: files are re-downloaded multiple times within a single SPA session

Created by: olafurpg

• Sourcegraph version: live version on dot-com
• Platform information: web

Steps to reproduce:

1. Open https://sourcegraph.com/github.com/chromium/chromium
2. Trigger Cmd+P to activate fuzzy finder, files are downloaded and indexed as expected
3. Search for "format", press Enter to select the first result and blob page loads as expected
4. Trigger Cmd+P to activate fuzzy finder again, files are re-downloaded and re-indexed.

Expected behavior:

I expected the files to be cached in step 4 to avoid the download and index steps. It's OK to re-download and re-index if the user hard refreshes their browser. My expectation is only that the files are cached within the same single-page app session.

Actual behavior:

Step 4.