Make message dialog more compact

Removed unnecessary spacing in the message dialog to improve visual
alignment and create a more compact, cleaner layout.

Fixes : #2929

Author: SougandhS

bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/IconAndMessageDialog.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2015 IBM Corporation and others.
+ * Copyright (c) 2000, 2025 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -100,13 +100,14 @@ protected Control createMessageArea(Composite composite) {
 		if (message != null) {
 			messageLabel = new Label(composite, getMessageLabelStyle());
 			messageLabel.setText(message);
+			int minWidthHint = convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH - 50);
 			GridDataFactory
 					.fillDefaults()
 					.align(SWT.FILL, SWT.BEGINNING)
 					.grab(true, false)
-					.hint(
-							convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH),
-							SWT.DEFAULT).applyTo(messageLabel);
+					.indent(5, 0)
+					.hint(message.length() > 40 ? minWidthHint : SWT.DEFAULT, SWT.DEFAULT)
+					.applyTo(messageLabel);
 		}
 		return composite;
 	}

bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/MessageDialog.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2016 IBM Corporation and others.
+ * Copyright (c) 2000, 2025 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -328,7 +328,6 @@ protected Control createDialogArea(Composite parent) {
 		layout.marginWidth = 0;
 		composite.setLayout(layout);
 		GridData data = new GridData(GridData.FILL_BOTH);
-		data.horizontalSpan = 2;
 		composite.setLayoutData(data);
 		// allow subclasses to add custom controls
 		customArea = createCustomArea(composite);