Test fixes

Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/function/editor/VarnodeLocationCellEditor.java

@@ -39,6 +39,7 @@ import ghidra.program.model.lang.Register;
 import ghidra.program.model.listing.Program;
 import ghidra.program.model.listing.ProgramContext;
 import ghidra.util.Msg;
+import ghidra.util.Swing;
 
 class VarnodeLocationCellEditor extends AbstractCellEditor
 		implements TableCellEditor, FocusableEditor {
@@ -193,6 +194,9 @@ class VarnodeLocationCellEditor extends AbstractCellEditor
 		registerEntryTextField = new DropDownSelectionTextField<>(registerModel);
 		registerEntryTextField.setBorder(null);
 
+		// this allows us to show the matching list when there is no text in the editor
+		registerEntryTextField.setShowMatchingListOnEmptyText(true);
+
 		AtomicReference<Register> currentReg = new AtomicReference<>();
 
 		Address address = varnode.getAddress();
@@ -219,7 +223,12 @@ class VarnodeLocationCellEditor extends AbstractCellEditor
 
 		registerEntryTextField.addActionListener(e -> stopCellEditing());
 
+		// Note: need to do this later.  At the time of construction, this text field is not yet
+		// showing.  The text field has checks to avoid showing the list if it is not showing.  By
+		// running later, this call will happen once the widget has been added to the table.
+		Swing.runLater(() -> {
 			registerEntryTextField.showMatchingList();
+		});
 
 		return registerEntryTextField;
 	}

Ghidra/Framework/Docking/src/main/java/docking/options/editor/IconPropertyEditor.java

@@ -151,14 +151,8 @@ public class IconPropertyEditor extends PropertyEditorSupport {
 		private Component buildTopPanel() {
 			JPanel panel = new JPanel(new BorderLayout());
 			dataModel = new IconDropDownDataModel();
-			dropDown = new DropDownSelectionTextField<>(dataModel) {
-				protected List<Icon> getMatchingData(String searchText) {
-					if (searchText.isBlank()) {
-						return ((IconDropDownDataModel) dataModel).getData();
-					}
-					return super.getMatchingData(searchText);
-				}
-			};
+			dropDown = new DropDownSelectionTextField<>(dataModel);
+			dropDown.setShowMatchingListOnEmptyText(true);
 			dropDown.addDropDownSelectionChoiceListener(choiceListener);
 			panel.add(dropDown, BorderLayout.CENTER);
 			JButton browseButton = new BrowseButton();

Ghidra/Framework/Docking/src/main/java/docking/widgets/DropDownTextField.java

@@ -91,6 +91,7 @@ public class DropDownTextField<T> extends JTextField implements GComponent {
 	private boolean consumeEnterKeyPress = true; // consume Enter presses by default
 	private boolean ignoreEnterKeyPress = false; // do not ignore enter by default
 	private boolean ignoreCaretChanges;
+	private boolean showMachingListOnEmptyText;
 
 	// We use an update manager to buffer requests to update the matches.  This allows us to be
 	// more responsive when the user is attempting to type multiple characters
@@ -354,6 +355,12 @@ public class DropDownTextField<T> extends JTextField implements GComponent {
 			return Collections.emptyList();
 		}
 
+		// By default we do not show the matches list is empty.  This seems less noisy.  Some  
+		// clients would rather have empty text show all available choices.
+		if (searchText.isEmpty() && !showMachingListOnEmptyText) {
+			return Collections.emptyList();
+		}
+
 		// get the sublist of matches--this may take a while
 		Cursor previousCursor = getCursor();
 		try {
@@ -377,8 +384,22 @@ public class DropDownTextField<T> extends JTextField implements GComponent {
 	 * text.
 	 */
 	public void showMatchingList() {
-		String text = pendingTextUpdate != null ? pendingTextUpdate : getText();
-		updateDisplayContents(text);
+
+		//
+		//  We temporarily enable this list to show for empty text, even if the text is not empty.
+		// This handles the default setting, which has this feature off.  We can refactor this class
+		// to allow us to make a direct call instead of using this temporary setting.  This seems
+		// simple enough for now.
+		//
+		boolean restore = showMachingListOnEmptyText;
+		try {
+			showMachingListOnEmptyText = true;
+			pendingTextUpdate = pendingTextUpdate != null ? pendingTextUpdate : getText();
+			updateManager.updateNow();
+		}
+		finally {
+			showMachingListOnEmptyText = restore;
+		}
 	}
 
 	/**
@@ -414,6 +435,15 @@ public class DropDownTextField<T> extends JTextField implements GComponent {
 		this.ignoreEnterKeyPress = ignore;
 	}
 
+	/**
+	 * Allows this text field to show all potential matches when the text of the field is empty.
+	 * The default is false.
+	 * @param show true to allow the list to be shown
+	 */
+	public void setShowMatchingListOnEmptyText(boolean show) {
+		this.showMachingListOnEmptyText = show;
+	}
+
 	/**
 	 * Sets the height of the matching window.  The default value is {@value #MIN_HEIGHT}.
 	 *

Ghidra/Framework/Docking/src/test/java/docking/widgets/AbstractDropDownTextFieldTest.java

@@ -30,7 +30,6 @@ import org.junit.After;
 import org.junit.Before;
 
 import docking.test.AbstractDockingTest;
-import ghidra.util.Msg;
 
 public abstract class AbstractDropDownTextFieldTest<T> extends AbstractDockingTest {
 
@@ -234,10 +233,10 @@ public abstract class AbstractDropDownTextFieldTest<T> extends AbstractDockingTe
 
 	protected void hideWindowPressKeyThenValidate(int keyCode) {
 		JWindow matchingWindow = textField.getActiveMatchingWindow();
-		matchingWindow.setVisible(false);
+		runSwing(() -> matchingWindow.setVisible(false));
 		waitForSwing();
-		assertTrue("The completion window is showing after a call to setVisible(false).",
-			!matchingWindow.isShowing());
+		assertFalse("The completion window is showing after a call to setVisible(false).",
+			matchingWindow.isShowing());
 		tpyeActionKey(keyCode);
 		assertTrue("The completion window is not showing after being trigger by a navigation key.",
 			matchingWindow.isShowing());
@@ -309,10 +308,6 @@ public abstract class AbstractDropDownTextFieldTest<T> extends AbstractDockingTe
 			return;
 		}
 
-		if (!matchingWindow.isShowing()) {
-			Msg.debug(this, "");
-		}
-
 		assertTrue("Window is not showing when it should be", matchingWindow.isShowing());
 	}
 

Ghidra/Framework/Docking/src/test/java/docking/widgets/DropDownTextFieldTest.java

@@ -435,4 +435,42 @@ public class DropDownTextFieldTest extends AbstractDropDownTextFieldTest<String>
 		Dimension windowSize = matchingWindow.getSize();
 		assertEquals(newSize, windowSize.height);
 	}
+
+	@Test
+	public void testShowMatchingListOnEmptyText() {
+
+		runSwing(() -> textField.setShowMatchingListOnEmptyText(false));
+
+		// insert some text and make sure the window is created
+		typeText("d", true);
+		assertMatchingWindowShowing();
+
+		// with this setting off, the list stays visible on empty text
+		clearText();
+		assertMatchingWindowHidden();
+
+		// even with this setting off, this method should always force the list to show
+		showMatchingList();
+		assertMatchingWindowShowing();
+
+		runSwing(() -> textField.setShowMatchingListOnEmptyText(true));
+
+		showMatchingList();
+		assertMatchingWindowShowing();
+
+		typeText("d", true);
+		assertMatchingWindowShowing();
+
+		// with this setting on, the list stays visible on empty text
+		clearText();
+		assertMatchingWindowShowing();
+
+		// with this setting on, this method should always force the list to show
+		showMatchingList();
+		assertMatchingWindowShowing();
+	}
+
+	private void showMatchingList() {
+		runSwing(() -> textField.showMatchingList());
+	}
 }