Fix minor issues

* Use SwingUtilities for Timer invocation
* Prevent multi-registration of filter dialog hotkey

Author: fhaag95

src/main/java/burp/CstcContextMenuItemsProvider.java

@@ -12,6 +12,7 @@
 import javax.swing.JMenu;
 import javax.swing.JMenuItem;
 import javax.swing.JTabbedPane;
+import javax.swing.SwingUtilities;
 
 import burp.api.montoya.MontoyaApi;
 import burp.api.montoya.ui.contextmenu.ContextMenuEvent;
@@ -105,7 +106,11 @@ private void highlightExtensionName() {
 
         @Override
         public void run() {
-            resetHighlighting();
+            SwingUtilities.invokeLater(new Runnable() {
+                public void run(){
+                    resetHighlighting();
+                }
+            });
         }
 
         };

src/main/java/de/usd/cstchef/view/RecipePanel.java

@@ -105,6 +105,8 @@ public class RecipePanel extends JPanel implements ChangeListener {
     private static ImageIcon plusIcon = new ImageIcon(Operation.class.getResource("/plus.png"));
     private static ImageIcon minusIcon = new ImageIcon(Operation.class.getResource("/minus.png"));
 
+    private static boolean filterDialogHotKeyRegistered = false;
+
     private JButton filters = new JButton("Filter");
 
     private JButton addLaneButton = new JButton();
@@ -249,10 +251,13 @@ public void actionPerformed(ActionEvent e) {
             }
         });
 
-        HotKey hotKey = HotKey.hotKey("Open Filter Dialog", "Ctrl+Shift+F");
-        HotKeyHandler handler = event -> filters.doClick();
-        BurpUtils.getInstance().getApi().userInterface().registerHotKeyHandler(hotKey, handler);
-        filters.setToolTipText("Hotkey from within a message editor: Ctrl + Shift + F");
+        if(!RecipePanel.filterDialogHotKeyRegistered){
+            HotKey hotKey = HotKey.hotKey("Open Filter Dialog", "Ctrl+Shift+F");
+            HotKeyHandler handler = event -> filters.doClick();
+            BurpUtils.getInstance().getApi().userInterface().registerHotKeyHandler(hotKey, handler);
+            filters.setToolTipText("Hotkey from within a message editor: Ctrl + Shift + F");
+            RecipePanel.filterDialogHotKeyRegistered = true;
+        }        
 
         bakeButton.setEnabled(!autoBake);
         controlsPanel.add(bakeButton);