add handling of default plugin installation

Author: jjw24

Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs

@@ -419,8 +419,30 @@ private void Install(UserPlugin plugin, string downloadedFilePath)
                         plugin.Name));
             }
 
-            var directory = string.IsNullOrEmpty(plugin.Version) ? $"{plugin.Name}-{Guid.NewGuid()}" : $"{plugin.Name}-{plugin.Version}";
-            var newPluginPath = Path.Combine(DataLocation.PluginsDirectory, directory);
+            var folderName = string.IsNullOrEmpty(plugin.Version) ? $"{plugin.Name}-{Guid.NewGuid()}" : $"{plugin.Name}-{plugin.Version}";
+
+            var defaultPluginIDs = new List<string>
+                                    {
+                                        "0ECADE17459B49F587BF81DC3A125110", // BrowserBookmark
+                                        "CEA0FDFC6D3B4085823D60DC76F28855", // Calculator
+                                        "572be03c74c642baae319fc283e561a8", // Explorer
+                                        "6A122269676E40EB86EB543B945932B9", // PluginIndicator
+                                        "9f8f9b14-2518-4907-b211-35ab6290dee7", // PluginsManager
+                                        "b64d0a79-329a-48b0-b53f-d658318a1bf6", // ProcessKiller
+                                        "791FC278BA414111B8D1886DFE447410", // Program
+                                        "D409510CD0D2481F853690A07E6DC426", // Shell
+                                        "CEA08895D2544B019B2E9C5009600DF4", // Sys
+                                        "0308FD86DE0A4DEE8D62B9B535370992", // URL
+                                        "565B73353DBF4806919830B9202EE3BF", // WebSearch
+                                        "5043CETYU6A748679OPA02D27D99677A" // WindowsSettings
+                                    };
+
+            // Treat default plugin differently, it needs to be removable along with each flow release
+            var installDirectory = !defaultPluginIDs.Any(x => x == plugin.ID)
+                                    ? DataLocation.PluginsDirectory
+                                    : Constant.PreinstalledDirectory;
+
+            var newPluginPath = Path.Combine(installDirectory, folderName);
 
             FilesFolders.CopyAll(pluginFolderPath, newPluginPath);