[Win32] Add SSO support for SWT Browser using Edge backend

Introduces a new system property to enable Single Sign-On:
- org.eclipse.swt.browser.Edge.allowSingleSignOnUsingOSPrimaryAccount

This allows SWT Browser to use the logged-in Windows account for SSO
with
Azure AD resources and Microsoft account-enabled websites when using the
Edge backend.

Author: konczdev

bundles/org.eclipse.swt/Eclipse SWT Browser/win32/org/eclipse/swt/browser/Edge.java

@@ -50,6 +50,7 @@ class Edge extends WebBrowser {
 	// System.getProperty() keys
 	static final String BROWSER_DIR_PROP = "org.eclipse.swt.browser.EdgeDir";
 	static final String BROWSER_ARGS_PROP = "org.eclipse.swt.browser.EdgeArgs";
+	static final String ALLOW_SINGLE_SIGN_ON_USING_OS_PRIMARY_ACCOUNT_PROP = "org.eclipse.swt.browser.Edge.allowSingleSignOnUsingOSPrimaryAccount";
 	static final String DATA_DIR_PROP = "org.eclipse.swt.browser.EdgeDataDir";
 	static final String LANGUAGE_PROP = "org.eclipse.swt.browser.EdgeLanguage";
 	static final String VERSIONT_PROP = "org.eclipse.swt.browser.EdgeVersion";
@@ -565,6 +566,9 @@ WebViewEnvironment createEnvironment() {
 	String browserDir = System.getProperty(BROWSER_DIR_PROP);
 	String browserArgs = System.getProperty(BROWSER_ARGS_PROP);
 	String language = System.getProperty(LANGUAGE_PROP);
+
+	boolean allowSSO = Boolean.getBoolean(ALLOW_SINGLE_SIGN_ON_USING_OS_PRIMARY_ACCOUNT_PROP);
+
 	String dataDir = getDataDir(display);
 
 	// Initialize options
@@ -582,6 +586,11 @@ WebViewEnvironment createEnvironment() {
 		options.put_Language(pLanguage);
 	}
 
+	if (allowSSO) {
+		int[] pAllowSSO = new int[]{1};
+		options.put_AllowSingleSignOnUsingOSPrimaryAccount(pAllowSSO);
+	}
+
 	// Create the environment
 	char[] pBrowserDir = stringToWstr(browserDir);
 	char[] pDataDir = stringToWstr(dataDir);

bundles/org.eclipse.swt/Readme.WebView2.md

@@ -67,6 +67,10 @@ language+country code that defines the browser UI language and preferred
 language for HTTP requests (`Accept-Languages` header).
 Example values: `en`, `ja`, `en-GB`, `de-AT`.
 
+The property `org.eclipse.swt.browser.Edge.allowSingleSignOnUsingOSPrimaryAccount` enables Single Sign-On with Azure Active Directory (AAD) resources using the logged-in Windows account. This also enables SSO with websites using Microsoft accounts associated with the Windows login. Setting this property to true enables this feature. The default value is false.
+
+See also: https://learn.microsoft.com/en-us/dotnet/api/microsoft.web.webview2.core.corewebview2environmentoptions.allowsinglesignonusingosprimaryaccount
+
 _Note_: All of the properties described above must be set before the first
 instance of the `Browser` with `SWT.EDGE` style is created.