Fix a comment.

So the user can't select a different device by mistake.

src/gui/mainwindow.cpp

@@ -116,6 +116,31 @@ void MainWindow::setupObjectNames()
     m_ScanProgressDialog->setObjectName(QStringLiteral("m_ScanProgressDialog"));
 }
 
+void MainWindow::setDisallowOtherDevices()
+{
+    // We need to store that we are hiding this for this session only
+    // but only if it's currently visible (ie, the user didn't select
+    // that it should be hidden on purpose.
+    if (m_DockDevices->isVisible() == true) {
+        Config::self()->setHideDeviceDockWidgetByCmdArgs(true);
+    }
+
+    // because of how Qt works, the user still can enable the
+    // dock widget via a mouse click, so we need to also set it to disabled.
+    // so that the user doesn't select it by mistake.
+
+    m_DockDevices->setVisible(false);
+    m_DockDevices->setEnabled(false);
+}
+
+void MainWindow::showDevicePanelIfPreviouslyHiddenByDisallowOtherDevices()
+{
+    if (Config::self()->hideDeviceDockWidgetByCmdArgs()) {
+        m_DockDevices->setVisible(true);
+        Config::self()->setHideDeviceDockWidgetByCmdArgs(false);
+    }
+}
+
 void MainWindow::init()
 {
     treeLog().init();

src/gui/mainwindow.h

@@ -50,6 +50,20 @@ public:
 
     void setCurrentPartitionByName(const QString& partitionNumber);
 
+    // forbids the user to select another device.
+    // this is used in conjunction with --device
+    // rationale is that if the user specifies a device,
+    // we can't allow him to select another one by mistake while
+    // clicking in the UI.
+    void setDisallowOtherDevices();
+
+    // disallowOtherDevices hides the DockWidget, but unfortunately
+    // this is saved by the Window State when restored, even if we
+    // are not disallowing it this time. At the same time the user
+    // could have hidden it, so we need to restore only if hidden
+    // just by the call to disallowOtherDevices().
+    void showDevicePanelIfPreviouslyHiddenByDisallowOtherDevices();
+
 Q_SIGNALS:
     void settingsChanged();
     void scanFinished();

src/main.cpp

@@ -131,6 +131,9 @@ int Q_DECL_IMPORT main(int argc, char* argv[])
             if (partitionNr.length()) {
                 mainWindow->setCurrentPartitionByName(selectedDevice);
             }
+            mainWindow->setDisallowOtherDevices();
+        } else {
+            mainWindow->showDevicePanelIfPreviouslyHiddenByDisallowOtherDevices();
         }
     });
 

src/partitionmanager.kcfg

@@ -167,5 +167,8 @@ SPDX-License-Identifier: GPL-3.0-or-later
 			</choices>
 			<default>random</default>
 		</entry>
+		<entry key="hideDeviceDockWidgetByCmdArgs" type="Bool">
+			<default>false</default>
+		</entry>
 	</group>
 </kcfg>