Improve error handling and robustness
636d6c2ecf13af9059a1ed991c2ae274e753dd68 End toPage sync when contentWindow is gone
This catches an error that seems to occur when switching from one app to another before the first app has loaded which otherwise prevents loading the second one.
6dedcfef6e18beea08d9dd58a736268b6991c2ef Call blobs.want only if blob is not yet present
This avoids calling
blobs.want if a blob is already present locally,
blobs.want may broadcast the
want to peers.
This uses a
blobs.size call to check for the presence of a blob, since historically
blobs.has could sometimes trigger wanting a blob.
It also adds use of
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