It's only valid to reuse a client that is not showing an embedded page, however we only get the embedded flag when a client sends a "currentPage" event.
There is a period between a client connecting and sending this event where we would consider it reusable when it's not. This fixes that by keeping a flag to indicate if a client has completed initializing (that is, it has sent its initial page).
See https://github.com/Dart-Code/Dart-Code/issues/4832
Change-Id: I9f2d43d1537ee97e4e231a844831e7548cf07beb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/336041
Reviewed-by: Ben Konyi <bkonyi@google.com>
Reviewed-by: Kenzie Davisson <kenzieschmoll@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>
Danny Tuppeny