SCH_PIN: Fix missing alt assign in copy ctor

eeschema/sch_pin.cpp

@@ -202,6 +202,7 @@ SCH_PIN::SCH_PIN( const SCH_PIN& aPin ) :
         m_hidden( aPin.m_hidden ),
         m_numTextSize( aPin.m_numTextSize ),
         m_nameTextSize( aPin.m_nameTextSize ),
+        m_alt( aPin.m_alt ),
         m_isDangling( aPin.m_isDangling )
 {
     SetName( aPin.m_name );

qa/tests/eeschema/test_sch_pin.cpp

@@ -113,6 +113,13 @@ BOOST_AUTO_TEST_CASE( Copy )
 
     BOOST_CHECK_EQUAL( copied.GetParentSymbol(), m_parent_symbol );
     BOOST_CHECK_EQUAL( copied.GetNumber(), m_lib_pin->GetNumber() );
+    BOOST_CHECK_EQUAL( copied.GetAlt(), wxEmptyString );
+
+    // Set some non-default values
+    copied.SetAlt( "alt" );
+
+    SCH_PIN copied2( copied );
+    BOOST_CHECK_EQUAL( copied2.GetAlt(), "alt" );
 }
 
 /**