Alt-click no longer buys a stack since patch 7.2

[croana]

Don't know if you're still updating the addon, but since they changed how stacks work in 7.2, alt-click no longer buys a full stack of 200.

I get this error:
4x [ADDON_ACTION_FORBIDDEN] AddOn 'GnomishVendorShrinker' tried to call the protected function 'RunBinding()'.
!BugGrabber\BugGrabber.lua:573: in function <!BugGrabber\BugGrabber.lua:573>
[C]: in function RunBinding' FrameXML\StackSplitFrame.lua:181: in function <FrameXML\StackSplitFrame.lua:178> [C]: in function Hide'
FrameXML\StackSplitFrame.lua:167: in function `StackSplitFrameOkay_Click'
FrameXML\StackSplitFrame.lua:112: in function <FrameXML\StackSplitFrame.lua:90>

Locals:
nil

[MuffinManKen]

A quick hack to make alt-clicks still work for Garrison Resources is:
local function OnClick(self, button)
local id = self:GetID()
local hasaltcurrency = ((GetMerchantItemCostInfo(id) > 0) and (select(4,GetMerchantItemCostItem(id, 1)) ~= "Garrison Resources"))