8274396: Suppress more warnings on non-serializable non-transient instance fields in client libs

Reviewed-by: bpb, naoto, serb, iris

src/java.desktop/share/classes/com/sun/beans/editors/FontEditor.java

@@ -220,6 +220,7 @@ public class FontEditor extends Panel implements java.beans.PropertyEditor {
     }
 
     private Font font;
+    @SuppressWarnings("serial") // Type of field is not Serializable
     private Toolkit toolkit;
     private String sampleText = "Abcde...";
 

src/java.desktop/share/classes/sun/awt/im/CompositionArea.java

@@ -61,9 +61,12 @@ import javax.swing.border.LineBorder;
 // This class is final due to the 6607310 fix. Refer to the CR for details.
 public final class CompositionArea extends JPanel implements InputMethodListener {
 
+    @SuppressWarnings("serial") // Type of field is not Serializable
     private CompositionAreaHandler handler;
 
+    @SuppressWarnings("serial") // Type of field is not Serializable
     private TextLayout composedTextLayout;
+    @SuppressWarnings("serial") // Type of field is not Serializable
     private TextHitInfo caret = null;
     private JFrame compositionWindow;
     private static final int TEXT_ORIGIN_X = 5;

src/java.desktop/share/classes/sun/awt/im/InputMethodJFrame.java

@@ -40,6 +40,7 @@ public class InputMethodJFrame
         extends JFrame
         implements InputMethodWindow {
 
+    @SuppressWarnings("serial") // Type of field is not Serializable
     InputContext inputContext = null;
 
     /**

src/java.desktop/share/classes/sun/awt/im/SimpleInputMethodWindow.java

@@ -38,6 +38,7 @@ public class SimpleInputMethodWindow
         extends Frame
         implements InputMethodWindow {
 
+    @SuppressWarnings("serial") // Type of field is not Serializable
     InputContext inputContext = null;
 
     /**

src/java.desktop/share/classes/sun/print/PrinterJobWrapper.java

@@ -39,6 +39,7 @@ public class PrinterJobWrapper implements PrintRequestAttribute {
     @Serial
     private static final long serialVersionUID = -8792124426995707237L;
 
+    @SuppressWarnings("serial") // Type of field is not Serializable
     private PrinterJob job;
 
     public PrinterJobWrapper(PrinterJob job) {