Fix debug console indices

These were off by one because the surface tab was removed.
Insetad of numbers look up the indices of the widgets so its
less prone to break in the future.

src/debug_console.cpp

@@ -609,7 +609,6 @@ DebugConsole::DebugConsole()
     m_ui->inputDevicesView->setItemDelegate(new DebugConsoleDelegate(this));
     m_ui->quitButton->setIcon(QIcon::fromTheme(QStringLiteral("application-exit")));
     m_ui->tabWidget->setTabIcon(0, QIcon::fromTheme(QStringLiteral("view-list-tree")));
-    m_ui->tabWidget->setTabIcon(1, QIcon::fromTheme(QStringLiteral("view-list-tree")));
 
     if (kwinApp()->operationMode() == Application::OperationMode::OperationModeX11) {
         m_ui->tabWidget->setTabEnabled(1, false); // Input Events
@@ -624,15 +623,15 @@ DebugConsole::DebugConsole()
     connect(m_ui->quitButton, &QAbstractButton::clicked, this, &DebugConsole::deleteLater);
     connect(m_ui->tabWidget, &QTabWidget::currentChanged, this, [this](int index) {
         // delay creation of input event filter until the tab is selected
-        if (index == 2 && !m_inputFilter) {
+        if (index == m_ui->tabWidget->indexOf(m_ui->input) && !m_inputFilter) {
             m_inputFilter = std::make_unique<DebugConsoleFilter>(m_ui->inputTextEdit);
             input()->installInputEventSpy(m_inputFilter.get());
         }
-        if (index == 5) {
+        if (index == m_ui->tabWidget->indexOf(m_ui->keyboard)) {
             updateKeyboardTab();
             connect(input(), &InputRedirection::keyStateChanged, this, &DebugConsole::updateKeyboardTab);
         }
-        if (index == 6) {
+        if (index == m_ui->tabWidget->indexOf(m_ui->clipboard)) {
             static_cast<DataSourceModel *>(m_ui->clipboardContent->model())->setSource(waylandServer()->seat()->selection());
             m_ui->clipboardSource->setText(sourceString(waylandServer()->seat()->selection()));
             connect(waylandServer()->seat(), &SeatInterface::selectionChanged, this, [this](AbstractDataSource *source) {