Fix cppcheck warnings and cleanup suppression config

- redundantAssignment
- knownConditionTrueFalse

cppcheck.supp

@@ -14,31 +14,24 @@ noExplicitConstructor
 // Ignore style issues in g2clib
 variableScope:src/plugins/weatherdata/gfs/g2clib/*.c
 
-// std::initializer_list should always be passed by value
-passedByValue:src/blackmisc/input/actionhotkeylist.h
-passedByValue:src/blackmisc/network/rawfsdmessagelist.cpp
-passedByValue:src/blackmisc/logcategorylist.h
-passedByValue:src/blackmisc/platformset.cpp
-passedByValue:src/blackmisc/geo/coordinategeodeticlist.cpp
-
-// variableHidingEnum for status message
-variableHidingEnum:src/blackmisc/statusmessage.h
-
 // Shared pointers should be passed by value
 passedByValue:src/blackmisc/lockfree.h
 
-// False positive caused by cppcheck getting confused with preprocessor defines
-ConfigurationNotChecked:src/xswiftbus/libxplanemp/src/XObjReadWrite.cpp
-
 // Passing std::function by value is acceptable
 passedByValue:src/xswiftbus/libxplanemp/src/ResourceManager.h
+passedByValue:tests/blackcore/expect.h
 passedByValue:src/xswiftbus/command.h
 
 // Unique pointers should be passed by value
 passedByValue:src/xswiftbus/menus.h
 passedByValue:src/xswiftbus/menus.cpp
 
-// Suddenly appearing (KB 2018-03) issue here
-// src/blackmisc/iterator.h 53 -> 'operator=' should return reference to 'this' instance.
+// cppcheck cannot handle the advanced workaround in use
 operatorEqRetRefThis:src/blackmisc/iterator.h
 
+// Ignore unusedFunction as it has too many false positives (especially in tests)
+unusedFunction
+
+// Return value of those functions is not required.
+ignoredReturnValue:src/blackmisc/dbusserver.cpp
+ignoredReturnValue:src/blackmisc/simplecommandparser.cpp

src/blackgui/components/dbautostashingcomponent.cpp

@@ -237,9 +237,10 @@ namespace BlackGui
             const int all = models.size();
 
             // maximum
+            int max = CDbStashComponent::MaxModelPublished;
             const QString maxStr(ui->le_MaxModelsStashed->text());
             bool okMaxStr = true;
-            int max = maxStr.isEmpty() ? CDbStashComponent::MaxModelPublished : maxStr.toInt(&okMaxStr);
+            if (!maxStr.isEmpty()) { max = maxStr.toInt(&okMaxStr); }
             if (!okMaxStr || max > all) { max = all; }
 
             // override description

src/blackgui/components/settingscomponent.cpp

@@ -74,8 +74,7 @@ namespace BlackGui
 
         void CSettingsComponent::initActions()
         {
-            QAction *a = nullptr;
-            a = new QAction(this);
+            QAction *a = new QAction(this);
             a->setObjectName("overview");
             a->setShortcut(QKeySequence(Qt::ALT + Qt::Key_S, Qt::Key_O));
             connect(a, &QAction::triggered, this, &CSettingsComponent::onActionTriggered);

src/blackgui/windowfinder.cpp

@@ -23,12 +23,13 @@ namespace BlackGui
 {
     IWindowFinder *IWindowFinder::create()
     {
-        IWindowFinder *finder = nullptr;
 
 #if defined(Q_OS_WIN)
-        finder = new CWindowFinderWindows();
+        IWindowFinder *finder = new CWindowFinderWindows();
 #elif defined(Q_OS_LINUX)
+        IWindowFinder *finder = nullptr;
 #elif defined(Q_OS_MACOS)
+        IWindowFinder *finder = nullptr;
 #endif
 
         return finder;

src/blackmisc/simulation/remoteaircraftprovider.cpp

@@ -614,6 +614,7 @@ namespace BlackMisc
             constexpr bool globalOffsetTest = false;
 
             const CCallsign cs(situation.getCallsign());
+            // cppcheck-suppress knownConditionTrueFalse
             if (!globalOffsetTest && !this->hasTestAltitudeOffset(cs)) { return situation; }
             CLength os;
             if (globalOffsetTest)

src/xswiftbus/dbusmessage.cpp

@@ -53,8 +53,7 @@ namespace XSwiftBus
 
     std::string CDBusMessage::getSender() const
     {
-        const char *sender = nullptr;
-        sender = dbus_message_get_sender(m_message);
+        const char *sender = dbus_message_get_sender(m_message);
         return sender ? std::string(sender) : std::string();
     }