8279614: The left line of the TitledBorder is not painted on 150 scale factor

src/java.desktop/share/classes/javax/swing/border/TitledBorder.java

@@ -33,6 +33,7 @@
 import java.awt.Insets;
 import java.awt.Rectangle;
 import java.awt.geom.Path2D;
+import java.awt.geom.Rectangle2D;
 import java.beans.ConstructorProperties;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
@@ -350,10 +351,10 @@ public void paintBorder(Component c, Graphics g, int x, int y, int width, int he
                     if (g2 instanceof Graphics2D) {
                         Graphics2D g2d = (Graphics2D) g2;
                         Path2D path = new Path2D.Float();
-                        path.append(new Rectangle(borderX, borderY, borderW, labelY - borderY), false);
-                        path.append(new Rectangle(borderX, labelY, labelX - borderX - TEXT_SPACING, labelH), false);
-                        path.append(new Rectangle(labelX + labelW + TEXT_SPACING, labelY, borderX - labelX + borderW - labelW - TEXT_SPACING, labelH), false);
-                        path.append(new Rectangle(borderX, labelY + labelH, borderW, borderY - labelY + borderH - labelH), false);
+                        path.append(new Rectangle2D.Float((float) borderX, borderY, borderW, labelY - borderY), false);
+                        path.append(new Rectangle2D.Float((float) (borderX - 0.5), labelY, labelX - borderX - TEXT_SPACING, labelH), false);
+                        path.append(new Rectangle2D.Float((float) (labelX + labelW + TEXT_SPACING - 0.5), labelY, borderX - labelX + borderW - labelW - TEXT_SPACING, labelH), false);
+                        path.append(new Rectangle2D.Float((float) (borderX - 0.5), labelY + labelH, borderW, borderY - labelY + borderH - labelH), false);
                         g2d.clip(path);
                     }
                     border.paintBorder(c, g2, borderX, borderY, borderW, borderH);

test/jdk/java/awt/TitledBorder/TitledBorderTest.java

@@ -0,0 +1,97 @@
+import java.awt.BorderLayout;
+import java.awt.Graphics2D;
+import java.awt.Robot;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import javax.imageio.ImageIO;
+import javax.swing.BorderFactory;
+import javax.swing.JCheckBox;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.UIManager;
+import javax.swing.UIManager.LookAndFeelInfo;
+import javax.swing.UnsupportedLookAndFeelException;
+import javax.swing.SwingUtilities;
+
+/*
+ * @test
+ * @key headful
+ * @bug 8279614
+ * @summary The left line of the TitledBorder is not painted on 150 scale factor
+ * @requires (os.family == "windows")
+ * @run main TitledBorderTest
+ */
+public class TitledBorderTest {
+
+  public static JFrame frame;
+  public static JPanel parentPanel;
+  public static JPanel childPanel;
+
+  public static void main(String[] args) throws Exception {
+    LookAndFeelInfo laf = UIManager.getInstalledLookAndFeels()[3];
+    System.out.println(laf);
+    SwingUtilities.invokeAndWait(() -> setLookAndFeel(laf));
+    SwingUtilities.invokeAndWait(() -> createAndShowGUI());
+
+    Robot robot = new Robot();
+
+    BufferedImage buff = new BufferedImage(frame.getWidth()*2, frame.getHeight()*2,
+            BufferedImage.TYPE_INT_ARGB);
+    Graphics2D graph = buff.createGraphics();
+    graph.scale(1.5, 1.5);
+    frame.paint(graph);
+    graph.dispose();
+
+    robot.waitForIdle();
+    if (buff.getRGB(20,80) != -6250336) {
+      System.out.println("Color " + buff.getRGB(21, 80));
+      saveImage(buff, "test.png");
+      throw new RuntimeException("Border was clipped or overdrawn.");
+    }
+
+    frame.dispose();
+  }
+
+  private static void createAndShowGUI() {
+    frame = new JFrame("Swing Test");
+    frame.setSize(new java.awt.Dimension(300, 200));
+    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+    parentPanel = new JPanel(new BorderLayout());
+    parentPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
+
+    childPanel = new JPanel(new BorderLayout());
+    childPanel.setBorder(BorderFactory.createTitledBorder("Title"));
+    childPanel.add(new JCheckBox(), BorderLayout.CENTER);
+
+    parentPanel.add(childPanel, BorderLayout.CENTER);
+
+    frame.getContentPane().add(parentPanel, BorderLayout.CENTER);
+
+    frame.pack();
+    frame.setLocationRelativeTo(null);
+    frame.setVisible(true);
+  }
+
+  private static void saveImage(BufferedImage image, String filename) {
+    try {
+      ImageIO.write(image, "png", new File(filename));
+    } catch (IOException e) {
+      // Don’t propagate the exception
+      e.printStackTrace();
+    }
+  }
+
+  private static void setLookAndFeel(UIManager.LookAndFeelInfo laf) {
+    try {
+      UIManager.setLookAndFeel(laf.getClassName());
+      System.out.println(laf.getName());
+    } catch (UnsupportedLookAndFeelException ignored){
+      System.out.println("Unsupported LookAndFeel: " + laf.getClassName());
+    } catch (ClassNotFoundException | InstantiationException |
+            IllegalAccessException e) {
+      throw new RuntimeException(e);
+    }
+  }
+}