[Edge] Improve dialog when WebView2 engine is not available #2035

When a browser is opened and the WebView2 engine used as default is not
available, a dialog pops up with additional information and the ability
to switch back to the Internet Explorer for the current application
session. By now, the dialog lacked the information that the switch to
the Internet Explorer is not permanent. In addition, it was not possible
to disable that dialog, e.g., for scenarios in which an application is
executed in some automation and such a popup blocks automated processes.

This change adapts the dialog message to clarify that the switch to
Internet Explorer will lose its effect on next application start and
refers to the information link which gives more insights on how to
permanently switch back to Internet Explorer. In addition, it adds a
system property to disable that dialog.

Contributes to
#2035

Author: HeikoKlare

bundles/org.eclipse.swt/Eclipse SWT Browser/common/org/eclipse/swt/browser/Browser.java

@@ -56,6 +56,8 @@ public class Browser extends Composite {
 	static final String PACKAGE_PREFIX = "org.eclipse.swt.browser."; //$NON-NLS-1$
 	static final String PROPERTY_DEFAULTTYPE = "org.eclipse.swt.browser.DefaultType"; //$NON-NLS-1$
 
+	static final String WEBIEW_UNAVAILABLE_DISABLED = "org.eclipse.swt.browser.DisableWebViewUnavailableDialog"; //$NON-NLS-1$
+
 /**
  * Constructs a new instance of this class given its parent
  * and a style value describing its behavior and appearance.
@@ -144,7 +146,7 @@ private record DialogOption(int index, String message) {};
 	private static final DialogOption CANCEL_OPTION = new DialogOption(SWT.CANCEL, "Cancel");
 
 	private static final String DIALOG_TITLE = "Default browser engine not available";
-	private static final String DIALOG_MESSAGE = "Microsoft Edge (WebView2) is not available. Do you want to use the legacy Internet Explorer?\n\nNote: It is necessary to reopen browsers for the change to take effect.";
+	private static final String DIALOG_MESSAGE = "Microsoft Edge (WebView2) is not available. Do you want to use the legacy Internet Explorer?\n\nNote: It is necessary to reopen browsers for the change to take effect and the effect will be lost at next application start. For information on how to permanently switch to Internet Explorer, press the \"Information\" button.";
 	private static final String FAQ_URL = "https://github.com/eclipse-platform/eclipse.platform/tree/master/docs/FAQ/FAQ_How_do_I_use_Edge-IE_as_the_Browser's_underlying_renderer.md";
 
 	private static final int DIALOG_OPTION_FLAGS = USE_IE_OPTION.index | MORE_INFORMATION_OPTION.index | CANCEL_OPTION.index;
@@ -156,7 +158,8 @@ private record DialogOption(int index, String message) {};
 	private static boolean shownOnce;
 
 	static void showAsync(Shell parentShell) {
-		if (shownOnce) {
+		if (shownOnce || Boolean.getBoolean(WEBIEW_UNAVAILABLE_DISABLED)) {
+			shownOnce = true;
 			return;
 		}
 		shownOnce = true;