[win32] Do not invert the pixels for the Button focus rectangle

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Button.java

@@ -1412,7 +1412,15 @@ LRESULT wmNotifyChild (NMHDR hdr, long wParam, long lParam) {
 							} else {
 								OS.SetRect (focusRect, nmcd.left+4, nmcd.top+4, nmcd.right-4, nmcd.bottom-4);
 							}
-							OS.DrawFocusRect(nmcd.hdc, focusRect);
+							// DrawFocusRect() inverts the pixels, which is an arbitrary color on a custom background.
+							long pen = OS.CreatePen(OS.PS_DOT, 1, foreground);
+							OS.SaveDC(nmcd.hdc);
+							OS.SelectObject(nmcd.hdc, pen);
+							OS.SelectObject(nmcd.hdc, OS.GetStockObject(OS.NULL_BRUSH));
+							OS.SetBkMode(nmcd.hdc, OS.TRANSPARENT);
+							OS.Rectangle(nmcd.hdc, focusRect.left, focusRect.top, focusRect.right, focusRect.bottom);
+							OS.RestoreDC(nmcd.hdc, -1);
+							OS.DeleteObject(pen);
 						}
 						return new LRESULT (OS.CDRF_SKIPDEFAULT);
 					}

examples/org.eclipse.swt.snippets/Snippets.md

@@ -60,6 +60,7 @@ To contribute a new snippet, [create a snippet contribution as a pull request](h
 - [create a tri-state button (toggle three states)](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet315.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet315.png "Preview for Snippet 315")
 - [create a non-rectangular button](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet294.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet294.png "Preview for Snippet 294")
 - [create buttons with wrapped titles](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet345.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet345.png "Preview for Snippet 345")
+- [show the focus indication on a button with a custom background and foreground](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet395.java)
 
 ### **Canvas**
 - [paint a circle in a canvas](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet245.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet245.png "Preview for Snippet 245")

examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet395.java

@@ -0,0 +1,57 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package org.eclipse.swt.snippets;
+
+/*
+ * Button example: focus indication on a button with a custom background and
+ * foreground. Tab between the controls to move the focus. On Windows the focus
+ * rectangle used to be XOR-inverted, which turned into an arbitrary
+ * complementary color on the saturated background below.
+ *
+ * For a list of all SWT example snippets see
+ * http://www.eclipse.org/swt/snippets/
+ */
+import org.eclipse.swt.*;
+import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.layout.*;
+import org.eclipse.swt.widgets.*;
+
+public class Snippet395 {
+	public static void main(String[] args) {
+		Display display = new Display();
+		Shell shell = new Shell(display);
+		shell.setText("Focus rectangle on a styled Button");
+		shell.setLayout(new GridLayout());
+
+		Text text = new Text(shell, SWT.BORDER);
+		text.setText("Tab out of this field");
+		text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
+
+		Button styled = new Button(shell, SWT.PUSH);
+		styled.setText("Styled default button");
+		styled.setBackground(new Color(0x00, 0x71, 0xBC));
+		styled.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
+		styled.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
+
+		Button plain = new Button(shell, SWT.PUSH);
+		plain.setText("Unstyled button");
+		plain.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
+
+		shell.setDefaultButton(styled);
+		shell.setSize(360, 200);
+		shell.open();
+		while (!shell.isDisposed()) {
+			if (!display.readAndDispatch())
+				display.sleep();
+		}
+		display.dispose();
+	}
+}