Setup: Moved uninstallation prompt dialog existence check to the GUI

ep_gui/GUI.c

@@ -2183,6 +2183,13 @@ static BOOL GUI_Build(HDC hDC, HWND hwnd, POINT pt)
                                 }
                             }
                             else if (!strncmp(line + 1, "uninstall", 6))
+                            {
+                                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));
@@ -2198,6 +2205,7 @@ static BOOL GUI_Build(HDC hDC, HWND hwnd, POINT pt)
                                     sei.lpParameters = L"/uninstall";
                                     ShellExecuteExW(&sei);
                                 }
+                            }
                             else if (!strncmp(line + 1, "update_weather", 14))
                             {
                                 PostMessageW(FindWindowW(_T(EPW_WEATHER_CLASSNAME), NULL), EP_WEATHER_WM_FETCH_DATA, 0, 0);

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));