Add "Buy similar" button to display item controls

Author: vaisest

src/Classes/ItemsTab.lua

@@ -14,6 +14,7 @@ local m_min = math.min
 local m_ceil = math.ceil
 local m_floor = math.floor
 local m_modf = math.modf
+local buySimilar = LoadModule("Classes/CompareBuySimilar")
 
 local rarityDropList = {
 	{ label = colorCodes.NORMAL.."Normal", rarity = "NORMAL" },
@@ -409,6 +410,15 @@ holding Shift will put it in the second.]])
 		self:SetDisplayItem()
 	end)
 
+	self.controls.displayItemBuySimilar = new("ButtonControl",
+		{ "LEFT", self.controls.removeDisplayItem, "RIGHT", true },
+		{ 8, 0, 100, 20 }, "Buy similar", function()
+			local itemSlot = self:GetComparisonSlotNameForItem(self.displayItem)
+			buySimilar.openPopup(self.displayItem, itemSlot, self.build)
+		end)
+	self.controls.displayItemBuySimilar.shown = function()
+		return self.displayItem
+	end
 	-- Section: Variant(s)
 
 	self.controls.displayItemSectionVariant = new("Control", {"TOPLEFT",self.controls.addDisplayItem,"BOTTOMLEFT"}, {0, 8, 0, function()