ADDED: Dynamic field columns in symbol chooser

CHANGED: Symbol chooser search now considers custom symbol fields

Visible columns can be controlled in database libraries.
In standard KiCad libraries, we show columns for all custom fields for now.

Customizable column visibility will be added in the future.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/11946

eeschema/sch_plugins/database/sch_database_plugin.cpp

@@ -153,6 +153,19 @@ void SCH_DATABASE_PLUGIN::GetSubLibraryNames( std::vector<wxString>& aNames )
 }
 
 
+void SCH_DATABASE_PLUGIN::GetAvailableSymbolFields( std::vector<wxString>& aNames )
+{
+    std::copy( m_customFields.begin(), m_customFields.end(), std::back_inserter( aNames ) );
+}
+
+
+void SCH_DATABASE_PLUGIN::GetDefaultSymbolFields( std::vector<wxString>& aNames )
+{
+    std::copy( m_defaultShownFields.begin(), m_defaultShownFields.end(),
+               std::back_inserter( aNames ) );
+}
+
+
 bool SCH_DATABASE_PLUGIN::CheckHeader( const wxString& aFileName )
 {
     // TODO: Implement this sometime; but CheckHeader isn't even called...
@@ -352,6 +365,11 @@ LIB_SYMBOL* SCH_DATABASE_PLUGIN::loadSymbolFromRow( const wxString& aSymbolName,
         field->SetNameShown( mapping.show_name );
 
         symbol->AddField( field );
+
+        m_customFields.insert( mapping.name );
+
+        if( mapping.visible_in_chooser )
+            m_defaultShownFields.insert( mapping.name );
     }
 
     return symbol;