Merge bitcoin-core/gui#509: Respect dialog modality and fix a regression in wallet unlock

f730bd7d580502ae3c3b5953ada3724b59f5cd9b scripted-diff: Rename ShowModalDialogAndDeleteOnClose (Hennadii Stepanov)
5d7666b15164a16aaf3af49af8f73ff4bd392f6a qt: Revert 7fa91e831227e556bd8a7ae3da64bd59d4f30d5f partially (Hennadii Stepanov)
89c277a6fca1149f10f8b55874c702c341679765 qt: Delay shutdown while a modal dialog is active (Hennadii Stepanov)
8c0eb80f41bca7b08c94de0f08692fac23e3e9f0 qt: Disable tray icon menu when a modal dialog is active (Hennadii Stepanov)
92427354dd5f80cb5c042e7afbcd386968161be4 qt, refactor: Use local QAction instances for the tray icon menu (Hennadii Stepanov)
58e16035c1fc513fce0b09e02c7d863c63ec990d qt, refactor: Drop BitcoinGUI::{send,receive}CoinsMenuAction members (Hennadii Stepanov)
fd667e73cd109bbfc14011f8c2c08556648b4c50 qt: Make show_hide_action dependent on the main window actual state (Hennadii Stepanov)
ee151d032789fa03daa44ab44dd0fd70e51b145c qt: Drop BitcoinGUI::toggleHideAction member (Hennadii Stepanov)
78189daac8d13870ab6ed8421b9ed067cf7ebac5 qt, refactor: Fill up trayIconMenu before connections (Hennadii Stepanov)
66afa286e519deda2fcfd580f190b7af13407e72 qt, refactor: Replace BitcoinGUI::trayIconActivated with a lambda (Hennadii Stepanov)
c3ca8364b2a8de8c73ecc0c7eed9608bd30e7e02 qt, refactor: Replace BitcoinGUI::macosDockIconActivated with a lambda (Hennadii Stepanov)

Pull request description:

  As pointed in bitcoin/bitcoin#23790 a regression in wallet unlock was introduced in bitcoin-core/gui#336 when a synchronous `AskPassphraseDialog` has been replaced with an asynchronous one.

  This PR reverts a call back to a synchronous mode.

  To make synchronous dialogs behave nice during shutdown some additional changes were made.

  Please note that disabling the tray icon menu when a modal dialog is active is useful itself as on master (4ad59042b359f473d5888ecee0c9288dcf98f1c9) it is possible to switch to the "Receive" tab while the GUI is waiting for a password for the "Send" tab:

  ![Screenshot from 2021-12-17 18-59-51](https://user-images.githubusercontent.com/32963518/146580710-0a755f24-a166-414b-be60-7863232ac778.png)

  This is confusing and must be avoided.

  Fixes bitcoin/bitcoin#23790.

ACKs for top commit:
  prayank23:
    tACK https://github.com/bitcoin-core/gui/pull/509/commits/f730bd7d580502ae3c3b5953ada3724b59f5cd9b

Tree-SHA512: 2b68275754190e4a9831b96e882d3c5b005e03909aeb6f2c5846da07199bb3efbb74ce87a9d25bb139f643c43d377a2051b221d553281fa5aefdd3181a58077f

10 files changed, 85 insertions, 83 deletions

diff --git a/src/qt/addressbookpage.cpp b/src/qt/addressbookpage.cpp
index a180b03c08..d59a4345f3 100644
--- a/src/qt/addressbookpage.cpp
+++ b/src/qt/addressbookpage.cpp
@@ -189,7 +189,7 @@ void AddressBookPage::onEditAction()
     dlg->setModel(model);
     QModelIndex origIndex = proxyModel->mapToSource(indexes.at(0));
     dlg->loadRow(origIndex.row());
-    GUIUtil::ShowModalDialogAndDeleteOnClose(dlg);
+    GUIUtil::ShowModalDialogAsynchronously(dlg);
 }
 
 void AddressBookPage::on_newAddress_clicked()
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 6a2781079c..eb31287c56 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -268,7 +268,11 @@ void BitcoinApplication::createWindow(const NetworkStyle *networkStyle)
     connect(window, &BitcoinGUI::quitRequested, this, &BitcoinApplication::requestShutdown);
 
     pollShutdownTimer = new QTimer(window);
-    connect(pollShutdownTimer, &QTimer::timeout, window, &BitcoinGUI::detectShutdown);
+    connect(pollShutdownTimer, &QTimer::timeout, [this]{
+        if (!QApplication::activeModalWidget()) {
+            window->detectShutdown();
+        }
+    });
 }
 
 void BitcoinApplication::createSplashScreen(const NetworkStyle *networkStyle)
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 0baacfe58c..7c22880dd1 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -261,10 +261,6 @@ void BitcoinGUI::createActions()
     sendCoinsAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_2));
     tabGroup->addAction(sendCoinsAction);
 
-    sendCoinsMenuAction = new QAction(sendCoinsAction->text(), this);
-    sendCoinsMenuAction->setStatusTip(sendCoinsAction->statusTip());
-    sendCoinsMenuAction->setToolTip(sendCoinsMenuAction->statusTip());
-
     receiveCoinsAction = new QAction(platformStyle->SingleColorIcon(":/icons/receiving_addresses"), tr("&Receive"), this);
     receiveCoinsAction->setStatusTip(tr("Request payments (generates QR codes and bitcoin: URIs)"));
     receiveCoinsAction->setToolTip(receiveCoinsAction->statusTip());
@@ -272,10 +268,6 @@ void BitcoinGUI::createActions()
     receiveCoinsAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_3));
     tabGroup->addAction(receiveCoinsAction);
 
-    receiveCoinsMenuAction = new QAction(receiveCoinsAction->text(), this);
-    receiveCoinsMenuAction->setStatusTip(receiveCoinsAction->statusTip());
-    receiveCoinsMenuAction->setToolTip(receiveCoinsMenuAction->statusTip());
-
     historyAction = new QAction(platformStyle->SingleColorIcon(":/icons/history"), tr("&Transactions"), this);
     historyAction->setStatusTip(tr("Browse transaction history"));
     historyAction->setToolTip(historyAction->statusTip());
@@ -290,12 +282,8 @@ void BitcoinGUI::createActions()
     connect(overviewAction, &QAction::triggered, this, &BitcoinGUI::gotoOverviewPage);
     connect(sendCoinsAction, &QAction::triggered, [this]{ showNormalIfMinimized(); });
     connect(sendCoinsAction, &QAction::triggered, [this]{ gotoSendCoinsPage(); });
-    connect(sendCoinsMenuAction, &QAction::triggered, [this]{ showNormalIfMinimized(); });
-    connect(sendCoinsMenuAction, &QAction::triggered, [this]{ gotoSendCoinsPage(); });
     connect(receiveCoinsAction, &QAction::triggered, [this]{ showNormalIfMinimized(); });
     connect(receiveCoinsAction, &QAction::triggered, this, &BitcoinGUI::gotoReceiveCoinsPage);
-    connect(receiveCoinsMenuAction, &QAction::triggered, [this]{ showNormalIfMinimized(); });
-    connect(receiveCoinsMenuAction, &QAction::triggered, this, &BitcoinGUI::gotoReceiveCoinsPage);
     connect(historyAction, &QAction::triggered, [this]{ showNormalIfMinimized(); });
     connect(historyAction, &QAction::triggered, this, &BitcoinGUI::gotoHistoryPage);
 #endif // ENABLE_WALLET
@@ -315,8 +303,6 @@ void BitcoinGUI::createActions()
     optionsAction->setStatusTip(tr("Modify configuration options for %1").arg(PACKAGE_NAME));
     optionsAction->setMenuRole(QAction::PreferencesRole);
     optionsAction->setEnabled(false);
-    toggleHideAction = new QAction(tr("&Show / Hide"), this);
-    toggleHideAction->setStatusTip(tr("Show or hide the main Window"));
 
     encryptWalletAction = new QAction(tr("&Encrypt Wallet…"), this);
     encryptWalletAction->setStatusTip(tr("Encrypt the private keys that belong to your wallet"));
@@ -376,7 +362,6 @@ void BitcoinGUI::createActions()
     connect(aboutAction, &QAction::triggered, this, &BitcoinGUI::aboutClicked);
     connect(aboutQtAction, &QAction::triggered, qApp, QApplication::aboutQt);
     connect(optionsAction, &QAction::triggered, this, &BitcoinGUI::optionsClicked);
-    connect(toggleHideAction, &QAction::triggered, this, &BitcoinGUI::toggleHidden);
     connect(showHelpMessageAction, &QAction::triggered, this, &BitcoinGUI::showHelpMessageClicked);
     connect(openRPCConsoleAction, &QAction::triggered, this, &BitcoinGUI::showDebugWindow);
     // prevents an open debug window from becoming stuck/unusable on client shutdown
@@ -627,8 +612,6 @@ void BitcoinGUI::setClientModel(ClientModel *_clientModel, interfaces::BlockAndH
             trayIcon->setVisible(optionsModel->getShowTrayIcon());
         }
     } else {
-        // Disable possibility to show main window via action
-        toggleHideAction->setEnabled(false);
         if(trayIconMenu)
         {
             // Disable context menu on tray icon
@@ -752,9 +735,7 @@ void BitcoinGUI::setWalletActionsEnabled(bool enabled)
 {
     overviewAction->setEnabled(enabled);
     sendCoinsAction->setEnabled(enabled);
-    sendCoinsMenuAction->setEnabled(enabled);
     receiveCoinsAction->setEnabled(enabled);
-    receiveCoinsMenuAction->setEnabled(enabled);
     historyAction->setEnabled(enabled);
     encryptWalletAction->setEnabled(enabled);
     backupWalletAction->setEnabled(enabled);
@@ -784,57 +765,82 @@ void BitcoinGUI::createTrayIcon()
 void BitcoinGUI::createTrayIconMenu()
 {
 #ifndef Q_OS_MAC
-    // return if trayIcon is unset (only on non-macOSes)
-    if (!trayIcon)
-        return;
-
-    trayIcon->setContextMenu(trayIconMenu.get());
-    connect(trayIcon, &QSystemTrayIcon::activated, this, &BitcoinGUI::trayIconActivated);
-#else
-    // Note: On macOS, the Dock icon is used to provide the tray's functionality.
-    MacDockIconHandler *dockIconHandler = MacDockIconHandler::instance();
-    connect(dockIconHandler, &MacDockIconHandler::dockIconClicked, this, &BitcoinGUI::macosDockIconActivated);
-    trayIconMenu->setAsDockMenu();
-#endif
+    if (!trayIcon) return;
+#endif // Q_OS_MAC
 
-    // Configuration of the tray icon (or Dock icon) menu
+    // Configuration of the tray icon (or Dock icon) menu.
+    QAction* show_hide_action{nullptr};
 #ifndef Q_OS_MAC
     // Note: On macOS, the Dock icon's menu already has Show / Hide action.
-    trayIconMenu->addAction(toggleHideAction);
+    show_hide_action = trayIconMenu->addAction(QString(), this, &BitcoinGUI::toggleHidden);
     trayIconMenu->addSeparator();
-#endif
+#endif // Q_OS_MAC
+
+    QAction* send_action{nullptr};
+    QAction* receive_action{nullptr};
+    QAction* sign_action{nullptr};
+    QAction* verify_action{nullptr};
     if (enableWallet) {
-        trayIconMenu->addAction(sendCoinsMenuAction);
-        trayIconMenu->addAction(receiveCoinsMenuAction);
+        send_action = trayIconMenu->addAction(sendCoinsAction->text(), sendCoinsAction, &QAction::trigger);
+        receive_action = trayIconMenu->addAction(receiveCoinsAction->text(), receiveCoinsAction, &QAction::trigger);
         trayIconMenu->addSeparator();
-        trayIconMenu->addAction(signMessageAction);
-        trayIconMenu->addAction(verifyMessageAction);
+        sign_action = trayIconMenu->addAction(signMessageAction->text(), signMessageAction, &QAction::trigger);
+        verify_action = trayIconMenu->addAction(verifyMessageAction->text(), verifyMessageAction, &QAction::trigger);
         trayIconMenu->addSeparator();
     }
-    trayIconMenu->addAction(optionsAction);
-    trayIconMenu->addAction(openRPCConsoleAction);
-#ifndef Q_OS_MAC // This is built-in on macOS
+    QAction* options_action = trayIconMenu->addAction(optionsAction->text(), optionsAction, &QAction::trigger);
+    options_action->setMenuRole(QAction::PreferencesRole);
+    QAction* node_window_action = trayIconMenu->addAction(openRPCConsoleAction->text(), openRPCConsoleAction, &QAction::trigger);
+    QAction* quit_action{nullptr};
+#ifndef Q_OS_MAC
+    // Note: On macOS, the Dock icon's menu already has Quit action.
     trayIconMenu->addSeparator();
-    trayIconMenu->addAction(quitAction);
-#endif
-}
+    quit_action = trayIconMenu->addAction(quitAction->text(), quitAction, &QAction::trigger);
 
-#ifndef Q_OS_MAC
-void BitcoinGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason)
-{
-    if(reason == QSystemTrayIcon::Trigger)
-    {
-        // Click on system tray icon triggers show/hide of the main window
-        toggleHidden();
-    }
-}
+    trayIcon->setContextMenu(trayIconMenu.get());
+    connect(trayIcon, &QSystemTrayIcon::activated, [this](QSystemTrayIcon::ActivationReason reason) {
+        if (reason == QSystemTrayIcon::Trigger) {
+            // Click on system tray icon triggers show/hide of the main window
+            toggleHidden();
+        }
+    });
 #else
-void BitcoinGUI::macosDockIconActivated()
-{
-    show();
-    activateWindow();
+    // Note: On macOS, the Dock icon is used to provide the tray's functionality.
+    MacDockIconHandler* dockIconHandler = MacDockIconHandler::instance();
+    connect(dockIconHandler, &MacDockIconHandler::dockIconClicked, [this] {
+        show();
+        activateWindow();
+    });
+    trayIconMenu->setAsDockMenu();
+#endif // Q_OS_MAC
+
+    connect(
+        // Using QSystemTrayIcon::Context is not reliable.
+        // See https://bugreports.qt.io/browse/QTBUG-91697
+        trayIconMenu.get(), &QMenu::aboutToShow,
+        [this, show_hide_action, send_action, receive_action, sign_action, verify_action, options_action, node_window_action, quit_action] {
+            if (show_hide_action) show_hide_action->setText(
+                (!isHidden() && !isMinimized() && !GUIUtil::isObscured(this)) ?
+                    tr("&Hide") :
+                    tr("S&how"));
+            if (QApplication::activeModalWidget()) {
+                for (QAction* a : trayIconMenu.get()->actions()) {
+                    a->setEnabled(false);
+                }
+            } else {
+                if (show_hide_action) show_hide_action->setEnabled(true);
+                if (enableWallet) {
+                    send_action->setEnabled(sendCoinsAction->isEnabled());
+                    receive_action->setEnabled(receiveCoinsAction->isEnabled());
+                    sign_action->setEnabled(signMessageAction->isEnabled());
+                    verify_action->setEnabled(verifyMessageAction->isEnabled());
+                }
+                options_action->setEnabled(optionsAction->isEnabled());
+                node_window_action->setEnabled(openRPCConsoleAction->isEnabled());
+                if (quit_action) quit_action->setEnabled(true);
+            }
+        });
 }
-#endif
 
 void BitcoinGUI::optionsClicked()
 {
@@ -847,7 +853,7 @@ void BitcoinGUI::aboutClicked()
         return;
 
     auto dlg = new HelpMessageDialog(this, /* about */ true);
-    GUIUtil::ShowModalDialogAndDeleteOnClose(dlg);
+    GUIUtil::ShowModalDialogAsynchronously(dlg);
 }
 
 void BitcoinGUI::showDebugWindow()
@@ -992,7 +998,7 @@ void BitcoinGUI::openOptionsDialogWithTab(OptionsDialog::Tab tab)
     connect(dlg, &OptionsDialog::quitOnReset, this, &BitcoinGUI::quitRequested);
     dlg->setCurrentTab(tab);
     dlg->setModel(clientModel->getOptionsModel());
-    GUIUtil::ShowModalDialogAndDeleteOnClose(dlg);
+    GUIUtil::ShowModalDialogAsynchronously(dlg);
 }
 
 void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, bool header, SynchronizationState sync_state)
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index 658ab5a210..0ae5f7331e 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -137,7 +137,6 @@ private:
     QAction* historyAction = nullptr;
     QAction* quitAction = nullptr;
     QAction* sendCoinsAction = nullptr;
-    QAction* sendCoinsMenuAction = nullptr;
     QAction* usedSendingAddressesAction = nullptr;
     QAction* usedReceivingAddressesAction = nullptr;
     QAction* signMessageAction = nullptr;
@@ -146,9 +145,7 @@ private:
     QAction* m_load_psbt_clipboard_action = nullptr;
     QAction* aboutAction = nullptr;
     QAction* receiveCoinsAction = nullptr;
-    QAction* receiveCoinsMenuAction = nullptr;
     QAction* optionsAction = nullptr;
-    QAction* toggleHideAction = nullptr;
     QAction* encryptWalletAction = nullptr;
     QAction* backupWalletAction = nullptr;
     QAction* changePassphraseAction = nullptr;
@@ -302,13 +299,6 @@ public Q_SLOTS:
     void showDebugWindowActivateConsole();
     /** Show help message dialog */
     void showHelpMessageClicked();
-#ifndef Q_OS_MAC
-    /** Handle tray icon clicked */
-    void trayIconActivated(QSystemTrayIcon::ActivationReason reason);
-#else
-    /** Handle macOS Dock icon clicked */
-    void macosDockIconActivated();
-#endif
 
     /** Show window if hidden, unminimize when minimized, rise when obscured or show if hidden and fToggleHidden is true */
     void showNormalIfMinimized() { showNormalIfMinimized(false); }
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index dc73bcd911..9565fa508f 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -984,7 +984,7 @@ void PrintSlotException(
     PrintExceptionContinue(exception, description.c_str());
 }
 
-void ShowModalDialogAndDeleteOnClose(QDialog* dialog)
+void ShowModalDialogAsynchronously(QDialog* dialog)
 {
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     dialog->setWindowModality(Qt::ApplicationModal);
diff --git a/src/qt/guiutil.h b/src/qt/guiutil.h
index 9b25b77325..0224b18b4e 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -426,7 +426,7 @@ namespace GUIUtil
     /**
      * Shows a QDialog instance asynchronously, and deletes it on close.
      */
-    void ShowModalDialogAndDeleteOnClose(QDialog* dialog);
+    void ShowModalDialogAsynchronously(QDialog* dialog);
 
     inline bool IsEscapeOrBack(int key)
     {
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index e37168830e..579ef0c3fd 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -930,7 +930,7 @@ void SendCoinsDialog::coinControlButtonClicked()
 {
     auto dlg = new CoinControlDialog(*m_coin_control, model, platformStyle);
     connect(dlg, &QDialog::finished, this, &SendCoinsDialog::coinControlUpdateLabels);
-    GUIUtil::ShowModalDialogAndDeleteOnClose(dlg);
+    GUIUtil::ShowModalDialogAsynchronously(dlg);
 }
 
 // Coin Control: checkbox custom change address
diff --git a/src/qt/transactionview.cpp b/src/qt/transactionview.cpp
index 1ab1333b72..778ef04b77 100644
--- a/src/qt/transactionview.cpp
+++ b/src/qt/transactionview.cpp
@@ -511,7 +511,7 @@ void TransactionView::editLabel()
                 : EditAddressDialog::EditSendingAddress, this);
             dlg->setModel(addressBook);
             dlg->loadRow(idx);
-            GUIUtil::ShowModalDialogAndDeleteOnClose(dlg);
+            GUIUtil::ShowModalDialogAsynchronously(dlg);
         }
         else
         {
@@ -520,7 +520,7 @@ void TransactionView::editLabel()
                 this);
             dlg->setModel(addressBook);
             dlg->setAddress(address);
-            GUIUtil::ShowModalDialogAndDeleteOnClose(dlg);
+            GUIUtil::ShowModalDialogAsynchronously(dlg);
         }
     }
 }
diff --git a/src/qt/walletframe.cpp b/src/qt/walletframe.cpp
index 08190f0b9f..91ce420a33 100644
--- a/src/qt/walletframe.cpp
+++ b/src/qt/walletframe.cpp
@@ -226,7 +226,7 @@ void WalletFrame::gotoLoadPSBT(bool from_clipboard)
 
     auto dlg = new PSBTOperationsDialog(this, currentWalletModel(), clientModel);
     dlg->openWithPSBT(psbtx);
-    GUIUtil::ShowModalDialogAndDeleteOnClose(dlg);
+    GUIUtil::ShowModalDialogAsynchronously(dlg);
 }
 
 void WalletFrame::encryptWallet()
diff --git a/src/qt/walletview.cpp b/src/qt/walletview.cpp
index 7954a66995..e7ec54721a 100644
--- a/src/qt/walletview.cpp
+++ b/src/qt/walletview.cpp
@@ -208,7 +208,7 @@ void WalletView::encryptWallet()
     auto dlg = new AskPassphraseDialog(AskPassphraseDialog::Encrypt, this);
     dlg->setModel(walletModel);
     connect(dlg, &QDialog::finished, this, &WalletView::encryptionStatusChanged);
-    GUIUtil::ShowModalDialogAndDeleteOnClose(dlg);
+    GUIUtil::ShowModalDialogAsynchronously(dlg);
 }
 
 void WalletView::backupWallet()
@@ -235,16 +235,18 @@ void WalletView::changePassphrase()
 {
     auto dlg = new AskPassphraseDialog(AskPassphraseDialog::ChangePass, this);
     dlg->setModel(walletModel);
-    GUIUtil::ShowModalDialogAndDeleteOnClose(dlg);
+    GUIUtil::ShowModalDialogAsynchronously(dlg);
 }
 
 void WalletView::unlockWallet()
 {
     // Unlock wallet when requested by wallet model
     if (walletModel->getEncryptionStatus() == WalletModel::Locked) {
-        auto dlg = new AskPassphraseDialog(AskPassphraseDialog::Unlock, this);
-        dlg->setModel(walletModel);
-        GUIUtil::ShowModalDialogAndDeleteOnClose(dlg);
+        AskPassphraseDialog dlg(AskPassphraseDialog::Unlock, this);
+        dlg.setModel(walletModel);
+        // A modal dialog must be synchronous here as expected
+        // in the WalletModel::requestUnlock() function.
+        dlg.exec();
     }
 }