Redesign Message Dialog

Removes unwanted space and aligns message content & buttons to center

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
@@ -105,7 +105,7 @@ protected Control createMessageArea(Composite composite) {
 					.align(SWT.FILL, SWT.BEGINNING)
 					.grab(true, false)
 					.hint(
-							convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH),
+							SWT.DEFAULT,
 							SWT.DEFAULT).applyTo(messageLabel);
 		}
 		return composite;
@@ -156,7 +156,7 @@ public void getName(AccessibleEvent event) {
 	 * @since 3.0
 	 */
 	protected int getMessageLabelStyle() {
-		return SWT.WRAP;
+		return SWT.CENTER;
 	}
 
 	/*
@@ -169,7 +169,7 @@ protected Control createButtonBar(Composite parent) {
 				// by createButton
 				.equalWidth(true).applyTo(composite);
 
-		GridDataFactory.fillDefaults().align(SWT.END, SWT.CENTER).span(2, 1)
+		GridDataFactory.fillDefaults().align(SWT.CENTER, SWT.CENTER).span(2, 1)
 				.applyTo(composite);
 		composite.setFont(parent.getFont());
 		// Add the buttons to the button bar.

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
@@ -327,8 +327,8 @@ protected Control createDialogArea(Composite parent) {
 		layout.marginHeight = 0;
 		layout.marginWidth = 0;
 		composite.setLayout(layout);
-		GridData data = new GridData(GridData.FILL_BOTH);
-		data.horizontalSpan = 2;
+		GridData data = new GridData(GridData.CENTER);
+		data.horizontalSpan = 1;
 		composite.setLayoutData(data);
 		// allow subclasses to add custom controls
 		customArea = createCustomArea(composite);
@@ -364,7 +364,7 @@ protected Button getButton(int index) {
 	 * @return the minimum message area width (in pixels)
 	 */
 	protected int getMinimumMessageWidth() {
-		return convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH);
+		return SWT.DEFAULT;
 	}
 
 	/**