fix(WeaselTSF): dump caused by menu of languagebar set nullptr unexpectedly

[fxliang]

fixed: #1760

[lotem]

Is this check necessary?

[atmgnd]

更新: 原因是 _GetFocusedContextWindow返回的句柄不符合要求(WHY), 但windbg查看是一个有效的句柄. 但sandbox里测试没有这个问题. 可能是其他什么软件或修改了Windows任务栏什么设置导致获取到的 句柄有差异 ?

使用自创建一临时窗口作为TrackPopupMenuEx的父窗口, 可以解决我电脑上的explorer崩溃问题. 内容如下, 仅供参考

 WeaselTSF/LanguageBar.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/WeaselTSF/LanguageBar.cpp b/WeaselTSF/LanguageBar.cpp
index a03b615..ebc04ea 100644
--- a/WeaselTSF/LanguageBar.cpp
+++ b/WeaselTSF/LanguageBar.cpp
@@ -166,7 +166,7 @@ STDAPI CLangBarItemButton::OnClick(TfLBIClick click,
     }
   } else if (click == TF_LBI_CLK_RIGHT) {
     /* Open menu */
-    HWND hwnd = _pTextService->_GetFocusedContextWindow();
+    HWND hwnd = CreateWindowEx(WS_EX_TOOLWINDOW, L"STATIC", L"WeaselMenuHost", WS_POPUP, 0, 0, 0, 0, HWND_DESKTOP, NULL, NULL, NULL);
     if (hwnd != NULL) {
       LANGID langid = get_language_id();
       HMENU menu;
@@ -178,10 +178,12 @@ STDAPI CLangBarItemButton::OnClick(TfLBIClick click,
         menu = LoadMenuW(g_hInst, MAKEINTRESOURCE(IDR_MENU_POPUP));
       }
       HMENU popupMenu = GetSubMenu(menu, 0);
+      SetForegroundWindow(hwnd);
       UINT wID = TrackPopupMenuEx(
           popupMenu, TPM_NONOTIFY | TPM_RETURNCMD | TPM_HORPOSANIMATION, pt.x,
           pt.y, hwnd, NULL);
       DestroyMenu(menu);
+      DestroyWindow(hwnd);
       _pTextService->_HandleLangBarMenuSelect(wID);
     }
   }

不过以上修改虽然没有崩溃了, 但目前有一个小问题就是在开始菜单弹出(按win)的时候, rime右键会创建菜单失败(没有菜单弹出但,也无崩溃). 对我只要不崩溃就行了(通知区域很容易右键误触)