A better solution to keep SPICE netlist from being entirely selected.

Fixes https://gitlab.com/kicad/code/kicad/issues/14177

common/dialog_shim.cpp

@@ -339,7 +339,7 @@ static void selectAllInTextCtrls( wxWindowList& children )
             {
                 // Respect an existing selection
             }
-            else
+            else if( childTextCtrl->IsEditable() )
             {
                 childTextCtrl->SelectAll();
             }
@@ -353,7 +353,7 @@ static void selectAllInTextCtrls( wxWindowList& children )
             {
                 // Respect an existing selection
             }
-            else if( !scintilla->GetText().Contains( wxT( "\n") ) )
+            else if( scintilla->IsEditable() )
             {
                 scintilla->SelectAll();
             }

eeschema/tools/simulator_control.cpp

@@ -375,6 +375,8 @@ public:
 
         textCtrl->SetLexer( wxSTC_LEX_SPICE );
 
+        textCtrl->SetEditable( false );
+
         wxBoxSizer* sizer = new wxBoxSizer( wxVERTICAL );
         sizer->Add( textCtrl, 1, wxEXPAND | wxALL, 5 );
         SetSizer( sizer );