x/tools/gopls: makes http requests to random websites while editing module directive

[josharian]

In an attempt to make a small reproducer for #43186, I created a go.mod that started:

module vanilla.xyz

After saving, I selected the word vanilla and started typing "chocolate" as a replacement. As I typed, gopls started attempting to retrieve results from intermediate domains choco.xyz, chocola.xyz, chocolat.xyz, despite me not hitting save. Sample alert from Little Snitch:

The partial module import path seemed to get cached, because well after I finished typing an hit save, I still got this error:

[stamblerre]

gopls currently tries to reload package metadata as you modify import statements in your file, which is why you saw these requests. We have made some changes in recent weeks to default to GOPROXY=off--can you try the latest gopls pre-release and confirm that it fixes the issue? You can download it by running GO111MODULE=on go get golang.org/x/tools/gopls@v0.6.0-pre.1.

[gopherbot]

Timed out in state WaitingForInfo. Closing.

(I am just a bot, though. Please speak up if this is a mistake or you have the requested information.)