Fix research triggers

https://mods.factorio.com/mod/hot-metals/discussion/674736fbab56c062e1c0dac6

hot-metals/data-updates.lua

@@ -1 +1 @@
-require("prototypes.item")
+require("prototypes.hot")

hot-metals/prototypes/hot.lua

@@ -1,6 +1,6 @@
 local spoil_ticks = settings.startup["hot-metals-time"].value * 60
 
-function createHotVariant(itemName)
+function createHotVariant(itemName, _spoil_ticks)
     -- Create new item
     local hotItem = table.deepcopy(data.raw.item[itemName])
     hotItem.name = "hot-" .. itemName
@@ -8,7 +8,7 @@ function createHotVariant(itemName)
     hotItem.icon = "__hot-metals__/graphics/icons/hot-" .. itemName .. ".png"
     hotItem.order = hotItem.order .. "-hot"
     hotItem.spoil_result = itemName
-    hotItem.spoil_ticks = spoil_ticks
+    hotItem.spoil_ticks = _spoil_ticks or spoil_ticks
     data:extend({ hotItem })
 
     -- Change recipes
@@ -17,6 +17,13 @@ function createHotVariant(itemName)
             recipe.results[1].name = hotItem.name
         end
     end
+
+    -- Change technology triggers
+    for _, tech in pairs(data.raw.technology) do
+        if tech.research_trigger and tech.research_trigger.item == itemName then
+            tech.research_trigger.item = hotItem.name
+        end
+    end
 end
 
 createHotVariant("copper-cable")