From 72bba9e917757428c7a24eff7b1e8a61822fd35c Mon Sep 17 00:00:00 2001
From: "Klare, Heiko" <Heiko.Klare@vector.com>
Date: Mon, 8 Jun 2026 16:25:17 +0200
Subject: [PATCH] Enable anti-aliasing for dirty indicator rendering

The dirty indicator for editor tabs does currently not use anti-aliasing
which makes it look quite jagged. This change enables anti-aliasing for
the rendering of the dirty indicator.
---
 .../common/org/eclipse/swt/custom/CTabFolderRenderer.java      | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/CTabFolderRenderer.java b/bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/CTabFolderRenderer.java
index 21e45f37dee..e736a22b295 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/CTabFolderRenderer.java	
+++ b/bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/CTabFolderRenderer.java	
@@ -747,7 +747,10 @@ private void drawDirtyIndicator(GC gc, Rectangle closeRect, boolean selected) {
 		if (!selected) {
 			gc.setAlpha(140);
 		}
+		int originalAntialias = gc.getAntialias();
+		gc.setAntialias(SWT.ON);
 		gc.fillOval(x, y, diameter, diameter);
+		gc.setAntialias(originalAntialias);
 		gc.setAlpha(originalAlpha);
 		gc.setBackground(originalBackground);
 	}