Fix for File explorer not showing up and multiple notepads (#3969)

* reverted the dedup code, file explorer shows up but so do duplicates

* Fixed file explorer and dedup

* Formatting

* Added tests for all the cases

* Formatting

* Tests

* take name and exe into consideration while calculating hash

* unique primes while calculating hash code

src/modules/launcher/Wox.Test/Plugins/ProgramPluginTest.cs

@@ -0,0 +1,143 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using NUnit.Framework;
+using Wox.Infrastructure;
+using Wox.Plugin;
+using Microsoft.Plugin.Program.Programs;
+using Moq;
+using System.IO;
+
+namespace Wox.Test.Plugins
+{
+    [TestFixture]
+    public class ProgramPluginTest
+    {
+        Win32 notepad_appdata = new Win32
+        {
+            Name = "Notepad",
+            ExecutableName = "notepad.exe",
+            FullPath = "c:\\windows\\system32\\notepad.exe",
+            LnkResolvedPath = "c:\\users\\powertoys\\appdata\\roaming\\microsoft\\windows\\start menu\\programs\\accessories\\notepad.lnk"
+        };
+
+        Win32 notepad_users = new Win32
+        {
+            Name = "Notepad",
+            ExecutableName = "notepad.exe",
+            FullPath = "c:\\windows\\system32\\notepad.exe",
+            LnkResolvedPath = "c:\\programdata\\microsoft\\windows\\start menu\\programs\\accessories\\notepad.lnk"
+        };
+
+        Win32 azure_command_prompt = new Win32
+        {
+            Name = "Microsoft Azure Command Prompt - v2.9",
+            ExecutableName = "cmd.exe",
+            FullPath = "c:\\windows\\system32\\cmd.exe",
+            LnkResolvedPath = "c:\\programdata\\microsoft\\windows\\start menu\\programs\\microsoft azure\\microsoft azure sdk for .net\\v2.9\\microsoft azure command prompt - v2.9.lnk"
+        };
+
+        Win32 visual_studio_command_prompt = new Win32
+        {
+            Name = "x64 Native Tools Command Prompt for VS 2019",
+            ExecutableName = "cmd.exe",
+            FullPath = "c:\\windows\\system32\\cmd.exe",
+            LnkResolvedPath = "c:\\programdata\\microsoft\\windows\\start menu\\programs\\visual studio 2019\\visual studio tools\\vc\\x64 native tools command prompt for vs 2019.lnk"
+        };
+
+        Win32 command_prompt = new Win32
+        {
+            Name = "Command Prompt",
+            ExecutableName = "cmd.exe",
+            FullPath = "c:\\windows\\system32\\cmd.exe",
+            LnkResolvedPath ="c:\\users\\powertoys\\appdata\\roaming\\microsoft\\windows\\start menu\\programs\\system tools\\command prompt.lnk"
+        };
+
+        Win32 file_explorer = new Win32
+        {
+            Name = "File Explorer",
+            ExecutableName = "File Explorer.lnk",
+            FullPath = "c:\\users\\powertoys\\appdata\\roaming\\microsoft\\windows\\start menu\\programs\\system tools\\file explorer.lnk",
+            LnkResolvedPath = null
+        };
+
+        Win32 wordpad = new Win32
+        {
+            Name = "Wordpad",
+            ExecutableName = "wordpad.exe",
+            FullPath = "c:\\program files\\windows nt\\accessories\\wordpad.exe",
+            LnkResolvedPath = "c:\\programdata\\microsoft\\windows\\start menu\\programs\\accessories\\wordpad.lnk"
+        };
+
+        Win32 wordpad_duplicate = new Win32
+        {
+            Name = "WORDPAD",
+            ExecutableName = "WORDPAD.EXE",
+            FullPath = "c:\\program files\\windows nt\\accessories\\wordpad.exe",
+            LnkResolvedPath = null
+        };
+
+
+        [Test]
+        public void DedupFunction_whenCalled_mustRemoveDuplicateNotepads()
+        {
+            // Arrange
+            List<Win32> prgms = new List<Win32>();
+            prgms.Add(notepad_appdata);
+            prgms.Add(notepad_users);
+
+            // Act
+            Win32[] apps = Win32.DeduplicatePrograms(prgms.AsParallel());
+
+            // Assert
+            Assert.AreEqual(apps.Length, 1);
+        }
+
+        [Test] 
+        public void DedupFunction_whenCalled_mustNotRemovelnkWhichdoesNotHaveExe()
+        {
+            // Arrange
+            List<Win32> prgms = new List<Win32>();
+            prgms.Add(file_explorer);
+
+            // Act
+            Win32[] apps = Win32.DeduplicatePrograms(prgms.AsParallel());
+
+            // Assert
+            Assert.AreEqual(apps.Length, 1);
+        }
+
+        [Test]
+        public void DedupFunction_mustRemoveDuplicates_forExeExtensionsWithoutLnkResolvedPath()
+        {
+            // Arrange
+            List<Win32> prgms = new List<Win32>();
+            prgms.Add(wordpad);
+            prgms.Add(wordpad_duplicate);
+
+            // Act
+            Win32[] apps = Win32.DeduplicatePrograms(prgms.AsParallel());
+
+            // Assert
+            Assert.AreEqual(apps.Length, 1);
+            Assert.IsTrue(!string.IsNullOrEmpty(apps[0].LnkResolvedPath));
+        }
+
+        [Test]
+        public void DedupFunction_mustNotRemovePrograms_withSameExeNameAndFullPath()
+        {
+            // Arrange
+            List<Win32> prgms = new List<Win32>();
+            prgms.Add(azure_command_prompt);
+            prgms.Add(visual_studio_command_prompt);
+            prgms.Add(command_prompt);
+
+            // Act
+            Win32[] apps = Win32.DeduplicatePrograms(prgms.AsParallel());
+
+            // Assert
+            Assert.AreEqual(apps.Length, 3);
+        }
+    }
+}