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How to? Global list style change Tasks: Strikethrough Subject when completed line-through

Question asked by Jeff C on Oct 14, 2015
In any list view when a Task module subject field is listed ANYWHERE (such as activities subpanel of Case view) I want the Task subject field value to use the strikethrough font style if the task status = closed.  

What's the most 'correct' way of achieving this? In other words which files do I copy to custom and where to add the conditional php to add the tags or whatever Sugar field that needs to be modified to pass the line-through style to that field value's display in the list?

Sugar 6.5