Setup: Moved uninstallation prompt dialog existence check to the GUI

ep_gui/GUI.c

@@ -2184,19 +2184,27 @@ static BOOL GUI_Build(HDC hDC, HWND hwnd, POINT pt)
                             }
                             else if (!strncmp(line + 1, "uninstall", 6))
                             {
-                                wchar_t uninstallLink[MAX_PATH];
-                                ZeroMemory(uninstallLink, sizeof(uninstallLink));
-                                SHGetFolderPathW(NULL, SPECIAL_FOLDER, NULL, SHGFP_TYPE_CURRENT, uninstallLink);
-                                wcscat_s(uninstallLink, MAX_PATH, _T(APP_RELATIVE_PATH) L"\\" _T(SETUP_UTILITY_NAME));
+                                HWND hwndExistingMb = FindWindowExW(NULL, NULL, L"#32770", _T(PRODUCT_NAME));
+                                if (hwndExistingMb)
+                                {
+                                    SwitchToThisWindow(hwndExistingMb, TRUE);
+                                }
+                                else
+                                {
+                                    wchar_t uninstallLink[MAX_PATH];
+                                    ZeroMemory(uninstallLink, sizeof(uninstallLink));
+                                    SHGetFolderPathW(NULL, SPECIAL_FOLDER, NULL, SHGFP_TYPE_CURRENT, uninstallLink);
+                                    wcscat_s(uninstallLink, MAX_PATH, _T(APP_RELATIVE_PATH) L"\\" _T(SETUP_UTILITY_NAME));
 
-                                SHELLEXECUTEINFOW sei;
-                                ZeroMemory(&sei, sizeof(SHELLEXECUTEINFOW));
-                                sei.cbSize = sizeof(sei);
-                                sei.hwnd = hwnd;
-                                sei.lpFile = uninstallLink;
-                                sei.nShow = SW_NORMAL;
-                                sei.lpParameters = L"/uninstall";
-                                ShellExecuteExW(&sei);
+                                    SHELLEXECUTEINFOW sei;
+                                    ZeroMemory(&sei, sizeof(SHELLEXECUTEINFOW));
+                                    sei.cbSize = sizeof(sei);
+                                    sei.hwnd = hwnd;
+                                    sei.lpFile = uninstallLink;
+                                    sei.nShow = SW_NORMAL;
+                                    sei.lpParameters = L"/uninstall";
+                                    ShellExecuteExW(&sei);
+                                }
                             }
                             else if (!strncmp(line + 1, "update_weather", 14))
                             {

ep_setup/ep_setup.c

@@ -517,13 +517,6 @@ int WINAPI wWinMain(
     bIsUpdate = (argc >= 1 && !_wcsicmp(wargv[0], L"/update_silent"));
     if (!bInstall && (!_wcsicmp(wargv[0], L"/uninstall") || bForcePromptForUninstall))
     {
-        HWND hwndExistingMb = FindWindowExW(NULL, NULL, L"#32770", _T(PRODUCT_NAME));
-        if (hwndExistingMb)
-        {
-            SwitchToThisWindow(hwndExistingMb, TRUE);
-            exit(0);
-        }
-
         wchar_t mbText[256];
         mbText[0] = 0;
         LoadStringW(hInstance, IDS_SETUP_UNINSTALL_PROMPT, mbText, ARRAYSIZE(mbText));