a bug: compatibility rules not checked when removing a block from a stack of statements

[ens-lg4]

Dear developers,

We have found another bug (similar to #12) and produced a test-case to demonstrate it.

Please navigate to http://ens-lg4.github.io/blockly_bug_report/ to reproduce
and to https://github.com/ens-lg4/blockly_bug_report to see the test-case files involved.

Many thanks in advance for your attention.

[NeilFraser]

Nicely spotted. I've added a patch (7cac5fe) and verified that it does not break typeless stacks, but haven't verified that it resolves this issue (though it absolutely should).

Out of curiosity, what are you working on? To my knowledge, you are the only ones using typed statement connections.

[ens-lg4]

Dear Neil, thank you very much for fixing it so fast!

I am working on Ensembl Hive project ( https://github.com/Ensembl/ensembl-hive/ ), it is a system for creating/running/monitoring computational pipelines. We have a language to describe pipeline structures in plain editable files, but they are much harder to healthcheck than to produce a fool-proof blockly diagram that also looks so nice and shiny :)