CmdPal: Add history to the new run page (#40427)

_⚠️ targets #39955_

This adds history support to the new run page.

* It'll initialize the history with the history from the run dialog, if
there is any.
* Any new commands that are run, or files/dirs that are opened will also
get added to the history
* history will persist across reboots

src/modules/cmdpal/Microsoft.Terminal.UI/RunHistory.cpp

@@ -0,0 +1,87 @@
+#include "pch.h"
+#include "RunHistory.h"
+#include "RunHistory.g.cpp"
+
+
+using namespace winrt::Windows;
+
+namespace winrt::Microsoft::Terminal::UI::implementation
+{
+    // Run history
+    // Largely copied from the Run work circa 2022.
+
+    winrt::Windows::Foundation::Collections::IVector<hstring> RunHistory::CreateRunHistory()
+    {
+        // Load MRU history
+        std::vector<hstring> history;
+
+        wil::unique_hmodule _comctl;
+        HANDLE(WINAPI* _createMRUList)(MRUINFO* lpmi);
+        int(WINAPI* _enumMRUList)(HANDLE hMRU,int nItem,void* lpData,UINT uLen);
+        void(WINAPI *_freeMRUList)(HANDLE hMRU);
+        int(WINAPI *_addMRUString)(HANDLE hMRU, LPCWSTR szString);
+
+        // Lazy load comctl32.dll
+        // Theoretically, we could cache this into a magic static, but we shouldn't need to actually do this more than once in CmdPal
+        _comctl.reset(LoadLibraryExW(L"comctl32.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32));
+
+        _createMRUList = reinterpret_cast<decltype(_createMRUList)>(GetProcAddress(_comctl.get(), "CreateMRUListW"));
+        FAIL_FAST_LAST_ERROR_IF(!_createMRUList);
+
+        _enumMRUList = reinterpret_cast<decltype(_enumMRUList)>(GetProcAddress(_comctl.get(), "EnumMRUListW"));
+        FAIL_FAST_LAST_ERROR_IF(!_enumMRUList);
+
+        _freeMRUList = reinterpret_cast<decltype(_freeMRUList)>(GetProcAddress(_comctl.get(), "FreeMRUList"));
+        FAIL_FAST_LAST_ERROR_IF(!_freeMRUList);
+
+        _addMRUString = reinterpret_cast<decltype(_addMRUString)>(GetProcAddress(_comctl.get(), "AddMRUStringW"));
+        FAIL_FAST_LAST_ERROR_IF(!_addMRUString);
+
+        static const WCHAR c_szRunMRU[] = REGSTR_PATH_EXPLORER L"\\RunMRU";
+        MRUINFO mi = {
+            sizeof(mi),
+            26,
+            MRU_CACHEWRITE,
+            HKEY_CURRENT_USER,
+            c_szRunMRU,
+            NULL // NOTE: use default string compare
+            // since this is a GLOBAL MRU
+        };
+
+        if (const auto hMruList = _createMRUList(&mi))
+        {
+            auto freeMRUList = wil::scope_exit([=]() {
+                _freeMRUList(hMruList);
+            });
+
+            for (int nMax = _enumMRUList(hMruList, -1, NULL, 0), i = 0; i < nMax; ++i)
+            {
+                WCHAR szCommand[MAX_PATH + 2];
+
+                const auto length = _enumMRUList(hMruList, i, szCommand, ARRAYSIZE(szCommand));
+                if (length > 1)
+                {
+                    // clip off the null-terminator
+                    std::wstring_view text{ szCommand, wil::safe_cast<size_t>(length - 1) };
+//#pragma disable warning(C26493)
+#pragma warning( push )
+#pragma warning( disable : 26493 )
+                    if (text.back() == L'\\')
+                    {
+                        // old MRU format has a slash at the end with the show cmd
+                        text = { szCommand, wil::safe_cast<size_t>(length - 2) };
+#pragma warning( pop )
+                        if (text.empty())
+                        {
+                            continue;
+                        }
+                    }
+                    history.emplace_back(text);
+                }
+            }
+        }
+
+        // Update dropdown & initial value
+        return winrt::single_threaded_observable_vector<winrt::hstring>(std::move(history));
+    }
+}