checking why a line was added to a plugin using the history tab .

checking why a line was added to a plugin using the history tab .

hey guys just a quick question about Jquery code on github , i was just going through the code on dropdown.js on git and saw the following lines of code : 

  1.     var desc = ' li:not(.disabled):visible a'
  2.     var $items = $parent.find('[role="menu"]' + desc + ', [role="listbox"]' + desc)

now what the query inside find actually evaluates to inside find is : 

"[role="menu"] li:not(.disabled):visible a, [role="listbox"] li:not(.disabled):visible a"; 

what i actually want is i want to take this line : 

dropdown.js and check in the history tab of the plugin , WHEN and WHY was this line added ? how do i do that , can somebody tell me ? 

this will be immencely helpful to me.


 Thank you .