Fix for Memory issue with context menu items (#4597)

* Added the inotifyPropertyChanged to all the properties and that stops the memory for shooting up

* some more inotify properties added

(cherry picked from commit 26fa05d9b661dadc5ab0257d540ab838a07c43a6)

* Revert "some more inotify properties added"

This reverts commit 845a94c9b2.

* Removed unnecessary inotifypropertychanged interfaces and cleaned up the code

* removed the ctrl+c from folder plugin

* removed unnecessary init

* Added unit test to check if PropertyChanged is called

* renamed var

* refactored the tests

* formatting and adding comments

* changed access modifier in test

* Used observable collection instead of a list

* clearing the observable collection instead of setting it to a new one

src/modules/launcher/Wox.Test/Wox.Test.csproj

@@ -44,6 +44,7 @@
     <ProjectReference Include="..\Wox.Core\Wox.Core.csproj" />
     <ProjectReference Include="..\Wox.Infrastructure\Wox.Infrastructure.csproj" />
     <ProjectReference Include="..\Wox.Plugin\Wox.Plugin.csproj" />
+    <ProjectReference Include="..\Wox\Wox.csproj" />
   </ItemGroup>
 
   <ItemGroup>

src/modules/launcher/Wox.Test/WoxTest.cs

@@ -0,0 +1,58 @@
+using System.Windows.Input;
+using NUnit.Framework;
+using Wox.Plugin;
+using Wox.ViewModel;
+using System.Runtime.CompilerServices;
+
+namespace Wox.Test
+{
+    [TestFixture]
+    public class Wox
+    {
+        // A Dummy class to test that OnPropertyChanged() is called while we set the variable
+        public class DummyTestClass : BaseModel
+        {
+            public bool isFunctionCalled = false;
+            private ICommand _item;
+
+            public ICommand Item
+            {
+                get
+                {
+                    return this._item;
+                }
+
+                set
+                {
+                    if (value != this._item)
+                    {
+                        this._item = value;
+                        OnPropertyChanged();
+                    }
+                }
+            }
+
+            // Overriding the OnPropertyChanged() function to test if it is being called
+            protected override void OnPropertyChanged([CallerMemberName] string propertyName = null)
+            {
+                isFunctionCalled = true;
+            }
+        }
+
+
+        [Test]
+        public void AnyVariable_MustCallOnPropertyChanged_WhenSet()
+        {
+            // Arrange
+            DummyTestClass testClass = new DummyTestClass();
+
+            // Act
+            testClass.Item = new RelayCommand(null);
+
+            // Assert
+            Assert.IsTrue(testClass.isFunctionCalled);
+
+        }
+
+    }
+}