The browser writes some workspace files to the client disk during normal
use. The webview service worker stores resources that have an ETag in
Cache Storage, and responses from /vscode-remote-resource can end up in
the HTTP disk cache. --disable-file-downloads does not cover either.
With --disable-file-cache, the webview resource loader sends no ETag for
a resource outside the webview's own extension, so the service worker
does not store it. /vscode-remote-resource responds with
`Cache-Control: no-store` for files outside the extension directories.
Extension files keep their ETags, so webviews still load extension code
from the cache. The flag is off by default.
cdrci