Fixed late update bug.

Fixed a bug where a widget would wait a frame to update but would not check whether it had been destroyed. Most promimently causing issues when the style of a slider widget constantly changed and was therefore destroyed and created every frame. Fixed by adding a check to make sure the widget was not discarded.

Author: SirMallard

lib/Internal.lua

@@ -438,8 +438,6 @@ return function(Iris: Types.Iris): Types.Internal
             if Internal._localRefreshActive then
                 -- we are redrawing every widget.
                 Internal._DiscardWidget(lastWidget)
-                -- so we don't accidentally discard it twice
-                lastWidget.lastCycleTick = -1
                 lastWidget = nil
             end
         end
@@ -616,6 +614,9 @@ return function(Iris: Types.Iris): Types.Internal
 
         -- using the widget class discard function.
         Internal._widgets[widgetToDiscard.type].Discard(widgetToDiscard)
+
+        -- mark as discarded
+        widgetToDiscard.lastCycleTick = -1
     end
 
     --[=[

lib/demoWindow.lua

@@ -77,11 +77,6 @@ return function(Iris: Types.Iris)
                 local ImageTransparencyState = Iris.State(Iris._config.ImageTransparency)
                 Iris.InputColor4({ "Image Tint" }, { color = ImageColorState, transparency = ImageTransparencyState })
 
-                Iris.PushConfig({
-                    ImageColor = ImageColorState:get(),
-                    ImageTransparency = ImageTransparencyState:get(),
-                })
-
                 Iris.Combo({ "Asset" }, { index = AssetState })
                 do
                     Iris.Selectable({ "Robux Small", "rbxasset://textures/ui/common/robux.png" }, { index = AssetState })
@@ -105,32 +100,51 @@ return function(Iris: Types.Iris)
                 Iris.End()
                 Iris.Checkbox({ "Pixelated" }, { isChecked = PixelatedCheckState })
 
+                Iris.PushConfig({
+                    ImageColor = ImageColorState:get(),
+                    ImageTransparency = ImageTransparencyState:get(),
+                })
                 Iris.Image({ AssetState:get(), SizeState:get(), RectState:get(), ScaleTypeState:get(), PixelatedState:get() })
+                Iris.PopConfig()
 
                 Iris.SeparatorText({ "Tile" })
-                local TileState = Iris.State(UDim2.fromScale(1, 1))
+                local TileState = Iris.State(UDim2.fromScale(0.5, 0.5))
                 Iris.SliderUDim2({ "Tile Size", nil, nil, UDim2.new(1, 240, 1, 240) }, { number = TileState })
 
+                Iris.PushConfig({
+                    ImageColor = ImageColorState:get(),
+                    ImageTransparency = ImageTransparencyState:get(),
+                })
                 Iris.Image({ "rbxasset://textures/grid2.png", SizeState:get(), nil, Enum.ScaleType.Tile, PixelatedState:get(), TileState:get() })
+                Iris.PopConfig()
 
                 Iris.SeparatorText({ "Slice" })
                 local SliceScaleState = Iris.State(1)
                 Iris.SliderNum({ "Image Slice Scale", 0.1, 0.1, 5 }, { number = SliceScaleState })
 
+                Iris.PushConfig({
+                    ImageColor = ImageColorState:get(),
+                    ImageTransparency = ImageTransparencyState:get(),
+                })
                 Iris.Image({ "rbxasset://textures/ui/chatBubble_blue_notify_bkg.png", SizeState:get(), nil, Enum.ScaleType.Slice, PixelatedState:get(), nil, Rect.new(12, 12, 56, 56), 1 }, SliceScaleState:get())
+                Iris.PopConfig()
 
                 Iris.SeparatorText({ "Image Button" })
                 local count = Iris.State(0)
+
                 Iris.SameLine()
                 do
+                    Iris.PushConfig({
+                        ImageColor = ImageColorState:get(),
+                        ImageTransparency = ImageTransparencyState:get(),
+                    })
                     if Iris.ImageButton({ "rbxasset://textures/AvatarCompatibilityPreviewer/add.png", UDim2.fromOffset(20, 20) }).clicked() then
                         count:set(count.value + 1)
                     end
+                    Iris.PopConfig()
 
                     Iris.Text({ `Click count: {count.value}` })
                 end
-
-                Iris.PopConfig()
                 Iris.End()
             end
             Iris.End()

lib/widgets/Input.lua

@@ -1136,7 +1136,9 @@ return function(Iris: Types.Internal, widgets: Types.WidgetUtility)
                     local desiredCycleTick: number = Iris._cycleTick + 1
                     Iris._postCycleCallbacks[callbackIndex] = function()
                         if Iris._cycleTick >= desiredCycleTick then
-                            Iris._widgets[`Slider{dataType}`].UpdateState(thisWidget)
+                            if thisWidget.lastCycleTick ~= -1 then
+                                Iris._widgets[`Slider{dataType}`].UpdateState(thisWidget)
+                            end
                             Iris._postCycleCallbacks[callbackIndex] = nil
                         end
                     end

lib/widgets/Window.lua

@@ -859,7 +859,9 @@ return function(Iris: Types.Internal, widgets: Types.WidgetUtility)
                 local desiredCycleTick: number = Iris._cycleTick + 1
                 Iris._postCycleCallbacks[callbackIndex] = function()
                     if Iris._cycleTick >= desiredCycleTick then
-                        ChildContainer.CanvasPosition = Vector2.new(0, stateScrollDistance)
+						if thisWidget.lastCycleTick ~= -1 then
+                        	ChildContainer.CanvasPosition = Vector2.new(0, stateScrollDistance)
+						end
                         Iris._postCycleCallbacks[callbackIndex] = nil
                     end
                 end