fix tooltip sometimes not showing in ItemsTab on dropdown items

Author: Peechey

src/Classes/ItemSlotControl.lua

@@ -47,7 +47,7 @@ local ItemSlotClass = newClass("ItemSlotControl", "DropDownControl", function(se
 	self.tooltipFunc = function(tooltip, mode, index, itemId)
 		local item = itemsTab.items[self.items[index]]
 		if main.popups[1] or mode == "OUT" or not item or (not self.dropped and itemsTab.selControl and itemsTab.selControl ~= self.controls.activate) then
-			tooltip:Clear()
+			tooltip:Clear(true)
 		elseif tooltip:CheckForUpdate(item, launch.devModeAlt, itemsTab.build.outputRevision) then
 			itemsTab:AddItemTooltip(tooltip, item, self)
 		end

src/Classes/Tooltip.lua

@@ -43,12 +43,16 @@ end
 local TooltipClass = newClass("Tooltip", function(self)
 	self.lines = { }
 	self.blocks = { }
+	self.iterate = 0
 	self:Clear()
 end)
 
-function TooltipClass:Clear()
+function TooltipClass:Clear(clearUpdateParams)
 	wipeTable(self.lines)
 	wipeTable(self.blocks)
+	if self.updateParams and clearUpdateParams then
+		wipeTable(self.updateParams)
+	end
 	self.tooltipHeader = false
 	self.titleYOffset = 0
 	self.recipe = nil
@@ -74,6 +78,8 @@ function TooltipClass:CheckForUpdate(...)
 	if doUpdate or self.updateParams.notSupportedModTooltips ~= main.notSupportedModTooltips then
 		self.updateParams.notSupportedModTooltips = main.notSupportedModTooltips
 		self:Clear()
+		self.iterate = self.iterate + 1
+		ConPrintf("Iteration count: "..self.iterate)
 		return true
 	end
 end