Better fix for not selecting all of netlist.

common/dialog_shim.cpp

@@ -354,7 +354,7 @@ static void selectAllInTextCtrls( wxWindowList& children )
             {
                 // Respect an existing selection
             }
-            else
+            else if( !scintilla->GetText().Contains( wxT( "\n") ) )
             {
                 scintilla->SelectAll();
             }

eeschema/sim/sim_plot_frame.cpp

@@ -1621,7 +1621,6 @@ void SIM_PLOT_FRAME::onShowNetlist( wxCommandEvent& event )
             textCtrl->SetWrapMode( wxSTC_WRAP_WORD );
 
             textCtrl->SetText( source );
-            textCtrl->ClearSelections();
 
             textCtrl->SetLexer( wxSTC_LEX_SPICE );