Revert "disabled updates as a test"

This reverts commit f8c4ac8c17.

src/debug/AssertInGuiThread.hpp

@@ -1,21 +0,0 @@
-#pragma once
-
-#include <QCoreApplication>
-#include <QThread>
-#include <cassert>
-
-namespace AB_NAMESPACE {
-
-static bool isGuiThread()
-{
-    return QCoreApplication::instance()->thread() == QThread::currentThread();
-}
-
-static void assertInGuiThread()
-{
-#ifdef _DEBUG
-    assert(isGuiThread());
-#endif
-}
-
-}  // namespace AB_NAMESPACE