test: hack to avoid VCLXToolkit calling CreateMainLoopThread

... for the PythonTest, similar to what vclbootstrapprotector does for
CppunitTest; actually no idea if this is a good idea or a bad idea.

Change-Id: Ia4e2e50fdc9c8deb9faf580a2f3f3308533265eb
Reviewed-on: https://gerrit.libreoffice.org/17540Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

test/source/bootstrapfixture.cxx

@@ -25,6 +25,7 @@
 #include <i18nlangtag/mslangid.hxx>
 #include <vcl/svapp.hxx>
 #include <tools/resmgr.hxx>
+#include <tools/link.hxx>
 #include <vcl/graphicfilter.hxx>
 #include <unotools/syslocaleoptions.hxx>
 #include <osl/file.hxx>
@@ -83,6 +84,15 @@ void test_init_impl(bool bAssertOnDialog, bool bNeedUCB,
     }
 }
 
+struct InitHook {
+    DECL_STATIC_LINK(InitHook, deinitHook, void*);
+};
+
+IMPL_STATIC_LINK_NOARG(InitHook, deinitHook) {
+    // nothing to do for now
+    return 0;
+}
+
 // this is called from pyuno
 SAL_DLLPUBLIC_EXPORT void test_init(lang::XMultiServiceFactory *pFactory)
 {
@@ -105,6 +115,9 @@ SAL_DLLPUBLIC_EXPORT void test_init(lang::XMultiServiceFactory *pFactory)
         if (test::isHeadless())
             Application::EnableHeadlessMode(true);
 
+        // avoid VCLXToolkit thinking that InitVCL hasn't been called
+        Application::setDeInitHook(LINK(nullptr, InitHook, deinitHook));
+
         test_init_impl(false, true, pFactory);
     }
     catch (...) { abort(); }