escapewindow

Thanks for the work so far! I know this is a trickier thing to port.

diff --git a/taskcluster/ci/docker-image/kind.yml b/taskcluster/ci/docker-image/kind.yml
--- a/taskcluster/ci/docker-image/kind.yml
+++ b/taskcluster/ci/docker-image/kind.yml
@@ -27,8 +27,10 @@ jobs:
   index-task:
     symbol: I(idx)
   funsize-update-generator:
     symbol: I(pg)