fix: Adjust for invalid splashscreen uri

This fixes an issue where the splashscreen image may not appear properly when the uno bootstrapper already rewrites the uri to include the package path.

Author: jeromelaban

src/Uno.UI/ts/WindowManager.ts

@@ -111,9 +111,12 @@ namespace Uno.UI {
 				const UNO_BOOTSTRAP_APP_BASE = config.environmentVariables["UNO_BOOTSTRAP_APP_BASE"] || "";
 				const UNO_BOOTSTRAP_WEBAPP_BASE_PATH = config.environmentVariables["UNO_BOOTSTRAP_WEBAPP_BASE_PATH"] || "";
 
-				const fullImagePath = UNO_BOOTSTRAP_APP_BASE !== ''
-					? `${UNO_BOOTSTRAP_WEBAPP_BASE_PATH}${UNO_BOOTSTRAP_APP_BASE}/${UnoAppManifest.splashScreenImage}`
-					: String(UnoAppManifest.splashScreenImage);
+				let fullImagePath = String(UnoAppManifest.splashScreenImage);
+
+				// If the splashScreenImage image already points to the app base path, use it, otherwise we build it.
+				if (UNO_BOOTSTRAP_APP_BASE !== '' && fullImagePath.indexOf(UNO_BOOTSTRAP_APP_BASE) == -1) {
+					fullImagePath = `${UNO_BOOTSTRAP_WEBAPP_BASE_PATH}${UNO_BOOTSTRAP_APP_BASE}/${UnoAppManifest.splashScreenImage}`;
+				}
 
 				img.src = fullImagePath;