Redo the fixes to event groups in connection.js
Redo the fixes to event groups in connection.js

google/blockly,rachel-fenichel/blockly,mark-friedman/blockly,rachel-fenichel/blockly,picklesrus/blockly,picklesrus/blockly,google/blockly,google/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,mark-friedman/blockly,google/blockly,rachel-fenichel/blockly,mark-friedman/blockly,google/blockly,mark-friedman/blockly,rachel-fenichel/blockly,picklesrus/blockly,rachel-fenichel/blockly,google/blockly,mark-friedman/blockly,mark-friedman/blockly,google/blockly