Add a diff column to FFLogs events table
Adds a 'Diff' column while browsing casts in event view on a fflogs.com report. The new column displays the time between events and can be set to show the difference between any two consecutive events or GCDs only.
--Version History--
1.0: Initial release
1.1: Adds a toggle above the table to toggle Diff mode between any events and GCDs only.
1.2: Fixed bug when navigating back and forth to the cast tab
