refactor(qt): remove redundant "toggle lock state" button

The new "(un)lock all" button supersedes "toggle lock state": it works
in both tree and list modes without requiring a mode-switch dialog.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: UdjinM6

src/qt/coincontroldialog.cpp

@@ -114,10 +114,7 @@ CoinControlDialog::CoinControlDialog(CCoinControl& coin_control, WalletModel* _m
     // (un)select all
     connect(ui->pushButtonSelectAll, &QPushButton::clicked, this, &CoinControlDialog::buttonSelectAllClicked);
 
-    // Toggle lock state
-    connect(ui->pushButtonToggleLock, &QPushButton::clicked, this, &CoinControlDialog::buttonToggleLockClicked);
-
-    // Unlock all locked coins
+    // (un)lock all
     connect(ui->pushButtonUnlockAll, &QPushButton::clicked, this, &CoinControlDialog::buttonUnlockAllClicked);
 
     ui->treeWidget->setColumnWidth(COLUMN_CHECKBOX, 94);
@@ -189,43 +186,6 @@ void CoinControlDialog::buttonSelectAllClicked()
     CoinControlDialog::updateLabels(m_coin_control, model, this);
 }
 
-// Toggle lock state
-void CoinControlDialog::buttonToggleLockClicked()
-{
-    QTreeWidgetItem *item;
-    // Works in list-mode only
-    if(ui->radioListMode->isChecked()){
-        ui->treeWidget->setEnabled(false);
-        for (int i = 0; i < ui->treeWidget->topLevelItemCount(); i++){
-            item = ui->treeWidget->topLevelItem(i);
-            COutPoint outpt(uint256S(item->data(COLUMN_ADDRESS, TxHashRole).toString().toStdString()), item->data(COLUMN_ADDRESS, VOutRole).toUInt());
-            // Don't toggle the lock state of partially mixed coins if they are not hidden in CoinJoin mode
-            if (m_coin_control.IsUsingCoinJoin() && !fHideAdditional && !model->isFullyMixed(outpt)) {
-                continue;
-            }
-            if (model->wallet().isLockedCoin(outpt)) {
-                model->wallet().unlockCoin(outpt);
-                item->setDisabled(false);
-                item->setIcon(COLUMN_CHECKBOX, QIcon());
-            }
-            else{
-                model->wallet().lockCoin(outpt, /*write_to_db=*/true);
-                item->setDisabled(true);
-                item->setIcon(COLUMN_CHECKBOX, GUIUtil::getIcon("lock_closed", GUIUtil::ThemedColor::RED));
-            }
-            updateLabelLocked();
-        }
-        ui->treeWidget->setEnabled(true);
-        CoinControlDialog::updateLabels(m_coin_control, model, this);
-    }
-    else{
-        QMessageBox msgBox(this);
-        msgBox.setObjectName("lockMessageBox");
-        msgBox.setText(tr("Please switch to \"List mode\" to use this function."));
-        msgBox.exec();
-    }
-}
-
 // (un)lock all
 void CoinControlDialog::buttonUnlockAllClicked()
 {

src/qt/coincontroldialog.h

@@ -108,7 +108,6 @@ private Q_SLOTS:
     void headerSectionClicked(int);
     void buttonBoxClicked(QAbstractButton*);
     void buttonSelectAllClicked();
-    void buttonToggleLockClicked();
     void buttonUnlockAllClicked();
     void updateLabelLocked();
     void on_hideButton_clicked();

src/qt/forms/coincontroldialog.ui

@@ -290,22 +290,6 @@
           </property>
          </widget>
         </item>
-        <item>
-         <widget class="QPushButton" name="pushButtonToggleLock">
-          <property name="sizePolicy">
-           <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
-            <horstretch>0</horstretch>
-            <verstretch>0</verstretch>
-           </sizepolicy>
-          </property>
-          <property name="text">
-           <string>toggle lock state</string>
-          </property>
-          <property name="autoDefault">
-           <bool>false</bool>
-          </property>
-         </widget>
-        </item>
         <item>
          <widget class="QPushButton" name="hideButton">
           <property name="sizePolicy">