fix(gui): try to resolve some causes of memory leak

jadx-gui/src/main/java/jadx/gui/ui/MainWindow.java

@@ -437,6 +437,7 @@ public class MainWindow extends JFrame {
 		LogCollector.getInstance().reset();
 		wrapper.close();
 		tabbedPane.closeAllTabs();
+		UiUtils.resetClipboardOwner();
 		System.gc();
 	}
 

jadx-gui/src/main/java/jadx/gui/ui/TabbedPane.java

@@ -373,49 +373,56 @@ public class TabbedPane extends JTabbedPane {
 		jumps.reset();
 		curTab = null;
 		lastTab = null;
+		FocusManager.reset();
 	}
 
 	@Nullable
 	public Component getFocusedComp() {
-		return FocusManager.isActive() ? FocusManager.focusedComp : null;
+		return FocusManager.getFocusedComp();
 	}
 
 	private static class FocusManager implements FocusListener {
-		static boolean active = false;
-		static FocusManager listener = new FocusManager();
-		static Component focusedComp;
+		private static final FocusManager INSTANCE = new FocusManager();
+		private static @Nullable Component focusedComp;
 
 		static boolean isActive() {
-			return active;
+			return focusedComp != null;
+		}
+
+		static void reset() {
+			focusedComp = null;
+		}
+
+		static Component getFocusedComp() {
+			return focusedComp;
 		}
 
 		@Override
 		public void focusGained(FocusEvent e) {
-			active = true;
 			focusedComp = (Component) e.getSource();
 		}
 
 		@Override
 		public void focusLost(FocusEvent e) {
-			active = false;
+			focusedComp = null;
 		}
 
 		static void listen(ContentPanel pane) {
 			if (pane instanceof ClassCodeContentPanel) {
-				((ClassCodeContentPanel) pane).getCodeArea().addFocusListener(listener);
-				((ClassCodeContentPanel) pane).getSmaliCodeArea().addFocusListener(listener);
+				((ClassCodeContentPanel) pane).getCodeArea().addFocusListener(INSTANCE);
+				((ClassCodeContentPanel) pane).getSmaliCodeArea().addFocusListener(INSTANCE);
 				return;
 			}
 			if (pane instanceof AbstractCodeContentPanel) {
-				((AbstractCodeContentPanel) pane).getCodeArea().addFocusListener(listener);
+				((AbstractCodeContentPanel) pane).getCodeArea().addFocusListener(INSTANCE);
 				return;
 			}
 			if (pane instanceof HtmlPanel) {
-				((HtmlPanel) pane).getHtmlArea().addFocusListener(listener);
+				((HtmlPanel) pane).getHtmlArea().addFocusListener(INSTANCE);
 				return;
 			}
 			if (pane instanceof ImagePanel) {
-				pane.addFocusListener(listener);
+				pane.addFocusListener(INSTANCE);
 				return;
 			}
 			// throw new JadxRuntimeException("Add the new ContentPanel to TabbedPane.FocusManager: " + pane);

jadx-gui/src/main/java/jadx/gui/ui/dialog/SearchDialog.java

@@ -147,6 +147,7 @@ public class SearchDialog extends CommonSearchDialog {
 		if (searchDisposable != null && !searchDisposable.isDisposed()) {
 			searchDisposable.dispose();
 		}
+		resultsModel.clear();
 		removeActiveTabListener();
 		super.dispose();
 	}
@@ -399,6 +400,7 @@ public class SearchDialog extends CommonSearchDialog {
 		if (searchTask != null) {
 			searchTask.cancel();
 			searchTask.waitTask();
+			searchTask = null;
 		}
 	}
 

jadx-gui/src/main/java/jadx/gui/utils/UiUtils.java

@@ -329,6 +329,23 @@ public class UiUtils {
 		}
 	}
 
+	/**
+	 * Owner field in Clipboard class can store reference to CodeArea.
+	 * This prevents from garbage collection whole jadx object tree and cause memory leak.
+	 * Trying to lost ownership by new empty selection.
+	 */
+	public static void resetClipboardOwner() {
+		try {
+			Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemSelection();
+			if (clipboard != null) {
+				StringSelection selection = new StringSelection("");
+				clipboard.setContents(selection, selection);
+			}
+		} catch (Exception e) {
+			LOG.error("Failed to reset clipboard owner", e);
+		}
+	}
+
 	public static int calcProgress(ITaskProgress taskProgress) {
 		return calcProgress(taskProgress.progress(), taskProgress.total());
 	}