Taskbar10: Various *important* fixes:

- Revised the method for enabling the old taskbar by intercepting the code path for initializing the new taskbar, due to a very rare issue where our hook does not get called on certain recent builds. (valinet#2499)
- Fixed crash on 25921+ due to the removal of pnidui.dll. (valinet#2558)
- Fixed potential stability issues when using the new taskbar on 22621.2787+.

ExplorerPatcher/Taskbar10.c

@@ -0,0 +1,45 @@
+#include "utility.h"
+
+#pragma region "Enable old taskbar"
+/***
+Our target is in `CTray::Init()`. It constructs either the Windows 11 or the Windows 10 taskbar based on the result of
+`winrt::WindowsUdk::ApplicationModel::AppExtensions::XamlExtensions::IsExtensionAvailable()`. We can to make the last
+argument of that function be set to false, so that we'll get the Windows 10 taskbar instead of the Windows 11 one that
+gets constructed through `CTray::InitializeTrayUIComponent()`.
+
+Alternatively, we can modify the behavior of `CTray::InitializeTrayUIComponent`. It contains the code to call
+`TrayUI_CreateInstance()` that resides in `Taskbar.dll` (checked through HKLM\SOFTWARE\Classes\CLSID\<the CLSID>) which
+is a copy of the Windows 10 taskbar code but modified over the time to support the Windows 11 taskbar. We see that it
+calls `CoCreateInstance` to get an `ITrayUIComponent` interface to an instance of `TrayUIComponent`. We hook that
+function to make it return our own custom `ITrayUIComponent` instance. Our `ITrayUIComponent::InitializeWithTray()`
+function calls `TrayUI_CreateInstance()` of `explorer.exe` that is also called when the last argument of
+`IsExtensionAvailable()` after the call is false.
+
+This way, we can get the Windows 10 taskbar which resides in explorer.exe without hooking LoadLibraryExW() in order to
+perform our initial method which has been known to be inconsistent on some systems. (Thanks feature flags!)
+***/
+
+static ULONG STDMETHODCALLTYPE nimplAddRefRelease(IUnknown* This)
+{
+    return 1;
+}
+
+static HRESULT STDMETHODCALLTYPE ITrayUIComponent_QueryInterface(ITrayUIComponent* This, REFIID riid, void** ppvObject)
+{
+    // Should never be called
+    return E_NOTIMPL;
+}
+
+static HRESULT STDMETHODCALLTYPE ITrayUIComponent_InitializeWithTray(ITrayUIComponent* This, ITrayUIHost* host, ITrayUI** result)
+{
+    return explorer_TrayUI_CreateInstanceFunc(host, &IID_ITrayUI, (void**)result);
+}
+
+static const ITrayUIComponentVtbl instanceof_ITrayUIComponentVtbl = {
+    .QueryInterface = ITrayUIComponent_QueryInterface,
+    .AddRef = nimplAddRefRelease,
+    .Release = nimplAddRefRelease,
+    .InitializeWithTray = ITrayUIComponent_InitializeWithTray
+};
+const ITrayUIComponent instanceof_ITrayUIComponent = { &instanceof_ITrayUIComponentVtbl };
+#pragma endregion