Make the TabList exclude hidden fields (#2764)
Make the TabList exclude hidden fields (#2764)

* Make the TabList exclude hidden fields

* Stop using private variable

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