Fix Acrylic backdrop misdetection caused by invalid flag comparison #117

ghost1372 · ghost1372 · commit 7da90100ce4d · 2025-11-02T23:44:26.000+03:30
Previously, CreateBackdropType() used a bitwise OR (|) check on DesktopAcrylicKind,
which is not a [Flags] enum. This caused regular Acrylic to be detected as AcrylicThin
after page reload. Updated the logic to use a direct equality check instead.
diff --git a/dev/DevWinUI/Services/ThemeService/ThemeService.cs b/dev/DevWinUI/Services/ThemeService/ThemeService.cs
@@ -138,7 +138,7 @@ private static BackdropType CreateBackdropType(SystemBackdrop systemBackdrop)
         }
         else if (systemBackdrop is AcrylicSystemBackdrop acrylic)
         {
-            return acrylic.Kind == (DesktopAcrylicKind.Base | DesktopAcrylicKind.Default) ? BackdropType.Acrylic : BackdropType.AcrylicThin;
+            return acrylic.Kind == DesktopAcrylicKind.Thin ? BackdropType.AcrylicThin : BackdropType.Acrylic;
         }
         else
         {

Original file line number	Diff line number	Diff line change
`@@ -138,7 +138,7 @@ private static BackdropType CreateBackdropType(SystemBackdrop systemBackdrop)`
`138`	`138`	`}`
`139`	`139`	`else if (systemBackdrop is AcrylicSystemBackdrop acrylic)`
`140`	`140`	`{`
`141`		`- return acrylic.Kind == (DesktopAcrylicKind.Base \| DesktopAcrylicKind.Default) ? BackdropType.Acrylic : BackdropType.AcrylicThin;`
	`141`	`+ return acrylic.Kind == DesktopAcrylicKind.Thin ? BackdropType.AcrylicThin : BackdropType.Acrylic;`
`142`	`142`	`}`
`143`	`143`	`else`
`144`	`144`	`{`