Index: trunk/src/org/openstreetmap/josm/tools/ImageProvider.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/ImageProvider.java	(revision 19640)
+++ trunk/src/org/openstreetmap/josm/tools/ImageProvider.java	(revision 19641)
@@ -83,4 +83,5 @@
 import com.github.weisj.jsvg.parser.LoaderContext;
 import com.github.weisj.jsvg.parser.SVGLoader;
+import com.github.weisj.jsvg.renderer.SVGRenderingHints;
 
 /**
@@ -1478,4 +1479,9 @@
         }
         return resizeMode.createBufferedImage(dim, new Dimension((int) sourceWidth, (int) sourceHeight), g -> {
+            // jsvg clips through Graphics2D#clip by default, which is not antialiased (jagged edges, see #18131).
+            // Soft clipping avoids that, but needs accurate mask/clip rendering, otherwise the clip is applied as a
+            // paint that the clipped elements' own paints override and parts of the image go missing.
+            g.setRenderingHint(SVGRenderingHints.KEY_SOFT_CLIPPING, SVGRenderingHints.VALUE_SOFT_CLIPPING_ON);
+            g.setRenderingHint(SVGRenderingHints.KEY_MASK_CLIP_RENDERING, SVGRenderingHints.VALUE_MASK_CLIP_RENDERING_ACCURACY);
             svg.render(null, g);
         }, null);