Katelyn Mann b11bd4fb71 Remove Blockly.removeAllRanges and replace it with calls to add/remove ...

css to mark text as unselectable instead.  I can't prove this is
significantly faster with numbers since the call to setup the time out
costs ~.1ms and the call when the timer fires is ~.05.  This happens on almost
every mouse event though.  Plus, it seems to remove a flicker of highlighting when
frames are skipped and keeps scrolling via the scrollbar from highlighting.

2016-03-28 10:06:43 -07:00

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