Fix StyleCopy for named-field vectors (Style Editor assert)

build/ImGui.luau

@@ -21982,7 +21982,7 @@ local function StyleCopy(dst, src)
         elseif type(v) == "table" and getmetatable(v) ~= nil and type(v[1]) == "number" then
             local c = dst[k]
             if type(c) ~= "table" then c = setmetatable({}, getmetatable(v)); dst[k] = c end
-            for _, key in ipairs({ "x", "y", "z", "w" }) do if rawget(v, key) ~= nil then c[key] = v[key] end end
+            for _, key in ipairs({ "x", "y", "z", "w" }) do if rawget(v, key) ~= nil then rawset(c, key, rawget(v, key)) end end
         else
             dst[k] = v
         end

imgui/imgui_demo_widgets.lua

@@ -1629,7 +1629,7 @@ local function StyleCopy(dst, src)
         elseif type(v) == "table" and getmetatable(v) ~= nil and type(v[1]) == "number" then
             local c = dst[k]
             if type(c) ~= "table" then c = setmetatable({}, getmetatable(v)); dst[k] = c end
-            for _, key in ipairs({ "x", "y", "z", "w" }) do if rawget(v, key) ~= nil then c[key] = v[key] end end
+            for _, key in ipairs({ "x", "y", "z", "w" }) do if rawget(v, key) ~= nil then rawset(c, key, rawget(v, key)) end end
         else
             dst[k] = v
         end

tools/test/scripts/t_style_editor.luau

@@ -0,0 +1,11 @@
+local G = require(game:GetService("ReplicatedStorage"):WaitForChild("ImGui"))
+local ImGui = G.ImGui
+ImGui.CreateContext(); G.ImGui_ImplRoblox.Init()
+local f = 0
+game:GetService("RunService").Stepped:Connect(function()
+    f += 1
+    G.ImGui_ImplRoblox.NewFrame(); ImGui.NewFrame()
+    ImGui.Begin("SE"); ImGui.ShowStyleEditor(); ImGui.End()
+    ImGui.Render(); G.ImGui_ImplRoblox.RenderDrawData(ImGui.GetDrawData())
+    if f == 10 then print("SE OK") end
+end)