Fix dialog focus handling under WSLg

pom.xml

@@ -109,7 +109,7 @@
         <repository>
             <id>netbeans</id>
             <name>NetBeans</name>
-            <url>http://netbeans.apidesign.org/maven2/</url>
+            <url>https://netbeans.apidesign.org/maven2/</url>
         </repository>
     </repositories>
     <dependencies>
@@ -152,6 +152,11 @@
             <artifactId>org-openide-util-lookup</artifactId>
             <version>RELEASE82</version>
         </dependency>
+        <dependency>
+            <groupId>org.netbeans.api</groupId>
+            <artifactId>org-openide-windows</artifactId>
+            <version>RELEASE82</version>
+        </dependency>
         <dependency>
             <groupId>org.netbeans.api</groupId>
             <artifactId>org-openide-modules</artifactId>

src/main/java/org/chrisle/netbeans/plugins/nbscratchfile/CreateScratchFile.java

@@ -17,13 +17,13 @@
 
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
-import javax.swing.JFrame;
 import org.chrisle.netbeans.plugins.nbscratchfile.ui.FilterableFileTypeDialog;
 import org.openide.awt.ActionID;
 import org.openide.awt.ActionReference;
 import org.openide.awt.ActionReferences;
 import org.openide.awt.ActionRegistration;
 import org.openide.util.NbBundle.Messages;
+import org.openide.windows.WindowManager;
 
 /**
  *
@@ -43,10 +43,14 @@
 })
 @Messages("CTL_CreateScratchFile=New Scratch File...")
 public final class CreateScratchFile implements ActionListener {
-    private final FilterableFileTypeDialog _dialog = new FilterableFileTypeDialog(new JFrame(), false);
+    private FilterableFileTypeDialog dialog;
 
     @Override
     public void actionPerformed(ActionEvent e) {
-        _dialog.showDialog();
+        if (dialog == null) {
+            dialog = new FilterableFileTypeDialog(WindowManager.getDefault().getMainWindow(), false);
+        }
+
+        dialog.showDialog();
     }
 }

src/main/java/org/chrisle/netbeans/plugins/nbscratchfile/ui/FilterableFileTypeDialog.java

@@ -17,6 +17,7 @@
 
 import java.awt.Color;
 import java.awt.Component;
+import java.awt.EventQueue;
 import java.awt.Frame;
 import java.awt.KeyboardFocusManager;
 import java.awt.event.ActionEvent;
@@ -125,13 +126,12 @@ public void keyReleased(KeyEvent e) {
         super.addWindowFocusListener(new WindowFocusListener() {
             @Override
             public void windowGainedFocus(WindowEvent e) {
-                searchField.setFocusable(true);
+                searchField.requestFocusInWindow();
             }
 
             @Override
             public void windowLostFocus(WindowEvent e) {
-                FilterableFileTypeDialog.this.setVisible(false);
-                searchField.setText("");
+                EventQueue.invokeLater(FilterableFileTypeDialog.this::closeIfFocusRemainsLost);
             }
         });
 
@@ -156,6 +156,15 @@ public void showDialog() {
         super.setVisible(true);
     }
 
+    private void closeIfFocusRemainsLost() {
+        KeyboardFocusManager focusManager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
+
+        if (isVisible() && !isFocused() && focusManager.getActiveWindow() != this) {
+            super.setVisible(false);
+            searchField.setText("");
+        }
+    }
+
     private static boolean languagesFilter(LanguageType lang, String str) {
         return lang.LanguageName().toLowerCase().contains(str.toLowerCase());
     }