Clear model name when switching to internal model.

Also fixes a bug to ensure that a modelLine gets written when using
an internal model.

Fixes https://gitlab.com/kicad/code/kicad/issues/14083

(cherry picked from commit 2e5bf0210a)

eeschema/sim/sim_model.cpp

@@ -1051,7 +1051,7 @@ void SIM_MODEL::doWriteFields( std::vector<T>& aFields ) const
 }
 
 
-bool SIM_MODEL::requiresSpiceModelLine() const
+bool SIM_MODEL::requiresSpiceModelLine( const SPICE_ITEM& aItem ) const
 {
     for( const PARAM& param : GetParams() )
     {

eeschema/sim/sim_model.h

@@ -40,6 +40,7 @@
 #include <enum_vector.h>
 
 class SIM_LIBRARY;
+class SPICE_ITEM;
 class SPICE_GENERATOR;
 class SIM_MODEL_SERIALIZER;
 class PROJECT;
@@ -524,7 +525,7 @@ private:
     template <typename T>
     void doWriteFields( std::vector<T>& aFields ) const;
 
-    virtual bool requiresSpiceModelLine() const;
+    virtual bool requiresSpiceModelLine( const SPICE_ITEM& aItem ) const;
 
 protected:
     std::vector<PARAM>                    m_params;

eeschema/sim/sim_model_kibis.h

@@ -89,7 +89,7 @@ public:
     bool m_enableDiff;
 
 private:
-    bool requiresSpiceModelLine() const override { return true; }
+    bool requiresSpiceModelLine( const SPICE_ITEM& aItem ) const override { return true; }
 
     static std::vector<PARAM::INFO> makeParamInfos( TYPE aType );
     static std::vector<PARAM::INFO> makeDcWaveformParamInfos();

eeschema/sim/sim_model_ngspice.cpp

@@ -215,8 +215,12 @@ bool SIM_MODEL_NGSPICE::canSilentlyIgnoreParam( const std::string& aParamName )
 }
 
 
-bool SIM_MODEL_NGSPICE::requiresSpiceModelLine() const
+bool SIM_MODEL_NGSPICE::requiresSpiceModelLine( const SPICE_ITEM& aItem ) const
 {
+    // Model must be written if there's no base model or the base model is an internal model
+    if( !m_baseModel || aItem.baseModelName == "" )
+        return true;
+
     for( int ii = 0; ii < GetParamCount(); ++ii )
     {
         const PARAM& param = m_params[ii];
@@ -229,10 +233,6 @@ bool SIM_MODEL_NGSPICE::requiresSpiceModelLine() const
         if ( param.value == "" )
             continue;
 
-        // Any non-empty parameter must be written if there's no base model
-        if( !m_baseModel )
-            return true;
-
         const SIM_MODEL_NGSPICE* baseModel = dynamic_cast<const SIM_MODEL_NGSPICE*>( m_baseModel );
         std::string              baseValue = baseModel->m_params[ii].value;
 

eeschema/sim/sim_model_ngspice.h

@@ -109,7 +109,7 @@ protected:
     int doFindParam( const std::string& aParamName ) const override;
 
 private:
-    bool requiresSpiceModelLine() const override;
+    bool requiresSpiceModelLine( const SPICE_ITEM& aItem ) const override;
 
     bool canSilentlyIgnoreParam( const std::string& aParamName );
 

eeschema/sim/sim_model_raw_spice.h

@@ -79,7 +79,7 @@ public:
 
 private:
     static std::vector<PARAM::INFO> makeParamInfos();
-    bool requiresSpiceModelLine() const override { return false; }
+    bool requiresSpiceModelLine( const SPICE_ITEM& aItem ) const override { return false; }
 
 private:
     std::string m_spiceCode;

eeschema/sim/sim_model_subckt.h

@@ -60,7 +60,7 @@ public:
     std::string GetSpiceCode() const;
 
 private:
-    bool requiresSpiceModelLine() const override { return true; }
+    bool requiresSpiceModelLine( const SPICE_ITEM& aItem ) const override { return true; }
 
     std::vector<std::unique_ptr<PARAM::INFO>> m_paramInfos;
 };

eeschema/sim/sim_model_switch.h

@@ -51,7 +51,7 @@ public:
     }
 
 private:
-    bool requiresSpiceModelLine() const override { return true; }
+    bool requiresSpiceModelLine( const SPICE_ITEM& aItem ) const override { return true; }
 
     static const std::vector<PARAM::INFO> makeSwVParamInfos();
     static const std::vector<PARAM::INFO> makeSwIParamInfos();

eeschema/sim/spice_generator.cpp

@@ -44,7 +44,7 @@ std::string SPICE_GENERATOR::ModelName( const SPICE_ITEM& aItem ) const
 
 std::string SPICE_GENERATOR::ModelLine( const SPICE_ITEM& aItem ) const
 {
-    if( !m_model.requiresSpiceModelLine() )
+    if( !m_model.requiresSpiceModelLine( aItem ) )
         return "";
 
     std::string result;