The data frame now subscribes to UPDATE_EXHAUSTION and stores a sliding
5-minute window of (time, exhaustion) samples. The XP tooltip uses the
first/last samples in the window to compute rest gain per hour, and
projects time to reach UnitXPMax * 1.5 at the current rate.
Useful for Turtle WoW's tent mechanic — when you stand under a tent
you accumulate rested XP at an accelerated rate, and now you can see
how long until you cap.
Samples reset on PLAYER_ENTERING_WORLD (zone change can change the
gain rate) and PLAYER_LEVEL_UP (Blizzard rescales exhaustion
proportionally on level-up so prior samples no longer describe the
same gain curve).
The rate/time lines only appear when there are at least 2 samples in
the window and the gain is positive — so they stay hidden when not
actively gaining rested XP.
Brues
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