Display only one parser error tab, even with multiple clicks. (#1590)

* Display only one parser error tab, even with multiple clicks.

* Properly close only parser error tabs.

Author: Hosch250

RetailCoder.VBE/Inspections/IParseTreeInspection.cs

@@ -4,7 +4,7 @@
 
 namespace Rubberduck.Inspections
 {
-    internal interface IParseTreeInspection : IInspection
+    public interface IParseTreeInspection : IInspection
     {
         ParseTreeResults ParseTreeResults { get; set; }
     }

RetailCoder.VBE/Inspections/ParameterNotUsedInspection.cs

@@ -16,14 +16,12 @@ public sealed class ParameterNotUsedInspection : InspectionBase
     {
         private readonly VBE _vbe;
         private readonly IMessageBox _messageBox;
-        private readonly ICodePaneWrapperFactory _wrapperFactory;
 
         public ParameterNotUsedInspection(VBE vbe, RubberduckParserState state, IMessageBox messageBox)
             : base(state)
         {
             _vbe = vbe;
             _messageBox = messageBox;
-            _wrapperFactory = new CodePaneWrapperFactory();
         }
 
         public override string Meta { get { return InspectionsUI.ParameterNotUsedInspectionName; }}

RetailCoder.VBE/UI/Command/ShowParserErrorsCommand.cs

@@ -42,9 +42,16 @@ public override void Execute(object parameter)
                 return;
             }
 
+            var oldTab = _viewModel.Tabs.FirstOrDefault(tab => tab.Header == RubberduckUI.Parser_ParserError);
+            
             _viewModel.AddTab(viewModel);
             _viewModel.SelectedTab = viewModel;
 
+            if (oldTab != null)
+            {
+                oldTab.CloseCommand.Execute(null);
+            }
+
             try
             {
                 var presenter = _presenterService.Presenter(_viewModel);

RetailCoder.VBE/UI/ParserErrors/ParserErrorsPresenter.cs

@@ -6,11 +6,6 @@
 
 namespace Rubberduck.UI.ParserErrors
 {
-    public interface IParserErrorsPresenterFactory
-    {
-        IParserErrorsPresenter Create();
-    }
-
     public interface IParserErrorsPresenter
     {
         void Show();