Don't reparse if there are no changes

Author: Hosch250

RetailCoder.VBE/UI/Command/RunAllTestsCommand.cs

@@ -24,26 +24,24 @@ public RunAllTestsCommand(RubberduckParserState state, ITestEngine engine, TestE
 
         public override void Execute(object parameter)
         {
-            _model.TestsRefreshed += TestsRefreshed;
-            _state.StateChanged += StateChanged;
-
-            _model.Refresh();
+            if (!_state.IsDirty())
+            {
+                RunTests();
+            }
+            else
+            {
+                _model.TestsRefreshed += TestsRefreshed;
+                _model.Refresh();
+            }
         }
 
         private void TestsRefreshed(object sender, EventArgs e)
         {
             RunTests();
         }
 
-        private void StateChanged(object sender, ParserStateEventArgs e)
-        {
-            if (e.State != ParserState.Ready) { return; }
-            RunTests();
-        }
-
         private void RunTests()
         {
-            _state.StateChanged -= StateChanged;
             _model.TestsRefreshed -= TestsRefreshed;
 
             var stopwatch = new Stopwatch();