dart/textDocument/publishOutline (and other notifications) are not sent for newly opened files

[DanTup]

While investigating #5047, I opened my augmentation testing project. It had main_augmentation.dart already open and in the logs I see a dart/textDocument/publishOutline for that file.

If I then click "Go to Augmented" CodeLens, it opens main.dart, but no outline is ever sent.

I suspect there is some race here, but it's the main reason of hitting the 5s timeout in #5047 and fixing this might be a better way to handle it (because changing the timeout of not waiting is a trade-off with negative consequences noted in microsoft/vscode#208900).

[DanTup]

Fix at https://dart-review.googlesource.com/c/sdk/+/360041

The issue was that an optimization to skip re-analyzing files as they're opened was also resulting in not getting these notifications.

[DanTup]

Fixed by dart-lang/sdk@41612e4, ships in SDK