Read can suspend while being shared

[cjb]

which we think breaks shared Read activities.

Workaround: Don't scroll around a PDF while also sharing it.

Proper fix: Don't suspend while an activity is shared, requires sugar to let us know when something is shared.

Actual Proper fix: Waking up on the network traffic that we're using as a protocol for collaboration.

[bemasc]

See also #6537, #6645.

[bemasc]

It should be easy to patch Read not to suspend if Read itself is shared. I might be able to find time to write that patch some time in the next 24 hours. I'm not sure exactly what that would fix, if anything.

[rwh]

I added this feature to Read-45 (soon to be available at http://dev.laptop.org/~rwh/Read-45.xo). However, it is currently impossible to un-share documents. After downloading from a document from a buddy, resuming it will result in an automatically shared instance of Read. The document can therefore never be read with suspend support.

Concluding, I don't think this is a proper fix; wake on network traffic sounds more appropriate.

[marco]

Per rwh comment.