Fixed terminal scrollbar disappearing when choice/confirmation prompt shown

CHANGELOG.md

@@ -1,3 +1,4 @@
+- Fixed terminal scrollbar disappearing when Claude shows a choice/confirmation prompt (https://github.com/nbclaudecodegui/NetbeansClaudeCodeGui/issues/22)
 - Fixed Cancel button sending Ctrl+C instead of Esc, making it impossible to exit /usage and similar screens
 - Fixed Default profile settings not saving in Tools → Options → Profiles (https://github.com/nbclaudecodegui/NetbeansClaudeCodeGui/issues/31)
 - Fixed "Open with Claude Code" context menu not applying Default profile settings (API key, proxy, Extra CLI args, etc.) (https://github.com/nbclaudecodegui/NetbeansClaudeCodeGui/issues/23)

src/main/java/io/github/nbclaudecodegui/ui/ClaudeSessionTab.java

@@ -787,7 +787,14 @@ private void switchSouthCard(String card) {
         if (southCard == null || southCardLayout == null) return;
         activeCard = card;
         southCardLayout.show(southCard, card);
-        splitPane.setEnabled(!CARD_CHOICE.equals(card));
+        // Disable only the divider when the choice menu is shown, not the whole
+        // splitPane.  setEnabled(false) on the splitPane propagates to all child
+        // components including the terminal widget's scrollbar, making it
+        // unresponsive.  Disabling only the divider prevents the user from
+        // dragging the splitter while leaving the terminal fully interactive.
+        if (splitPane.getUI() instanceof javax.swing.plaf.basic.BasicSplitPaneUI ui) {
+            ui.getDivider().setEnabled(!CARD_CHOICE.equals(card));
+        }
         if (!CARD_CHOICE.equals(card)) {
             // restore divider for this card
             int total = splitPane.getHeight();

src/test/java/io/github/nbclaudecodegui/ui/ChoiceMenuPanelTest.java

@@ -637,6 +637,56 @@ void preferredHeightAfterSplitPaneValidateCoversAllContent() throws Exception {
         });
     }
 
+    // -------------------------------------------------------------------------
+    // Regression: splitPane must stay enabled when choice menu is shown (#22)
+    // -------------------------------------------------------------------------
+
+    /**
+     * Regression test for issue #22: showing the choice menu must not disable
+     * the {@link JSplitPane}.  Disabling the whole splitPane propagated to all
+     * child components including the terminal scrollbar, making it unresponsive.
+     * The fix disables only the divider via {@code BasicSplitPaneUI.getDivider()}.
+     */
+    @Test
+    void splitPaneRemainsEnabledWhenChoiceMenuShown() throws Exception {
+        SwingUtilities.invokeAndWait(() -> {
+            ChoiceMenuPanel choiceMenuPanel = new ChoiceMenuPanel(() -> null);
+            JPanel promptPanel = new JPanel();
+
+            java.awt.CardLayout cardLayout = new java.awt.CardLayout();
+            JPanel southCard = new JPanel(cardLayout);
+            southCard.add(promptPanel,     "prompt");
+            southCard.add(choiceMenuPanel, "choice");
+
+            JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
+                    new JPanel(), southCard);
+
+            JFrame frame = new JFrame();
+            frame.add(splitPane);
+            frame.setSize(400, 600);
+            frame.setVisible(true);
+
+            try {
+                choiceMenuPanel.show(new ChoiceMenuModel("Continue?",
+                        List.of(new Option("Yes", "1"), new Option("No", "2")), -1),
+                        answer -> {});
+                cardLayout.show(southCard, "choice");
+
+                // Simulate the production switchSouthCard(CARD_CHOICE) path:
+                // only the divider is disabled, not the whole splitPane.
+                if (splitPane.getUI() instanceof javax.swing.plaf.basic.BasicSplitPaneUI ui) {
+                    ui.getDivider().setEnabled(false);
+                }
+
+                assertTrue(splitPane.isEnabled(),
+                        "splitPane must remain enabled when choice menu is shown — " +
+                        "disabling it would also disable the terminal scrollbar (issue #22)");
+            } finally {
+                frame.dispose();
+            }
+        });
+    }
+
     // -------------------------------------------------------------------------
     // helpers
     // -------------------------------------------------------------------------