==================================================================== It's such a low priority issue that is also obviously not going to get attention that I'm not going to bother anymore.

To put it simple, if you have very low hp, buy something in the shop (before you're full hp) and (now at full hp) undo it you will go back to the hp you were at when you bought it. By hp, this also happens with mana, energy, rage, etc, pretty much what the "Undo" feature is doing now is bringing your champion from back in time from when you bought/sold that item, instead of only doing that to the items. Note: So far, only seems to affect hp/mp/energy/rage/etc (tested on hp/mp/etc, skill levels, death timers and buff timers)

Reproduction steps: 1- Have champion at lowest hp possible without dying (the less hp % the more reaction time you have) 2- Buy/sell item before reaching full hp (preferably a non hp item just to be sure) 3- Once full hp, undo buying/selling the item and you should be at the same hp/mp you were when you bought/sold it.

[Bug still active?] = Yes / Patch 5.2