testcon: Set MainWindow instance pointer after setupUi().

Otherwise, the application crashes when debug messages
are emitted while creating window. Amends
fc55372413a064baa049f28a13cba1406b132cfb.

Task-number: QTBUG-49712
Change-Id: I393d46431fbafb6aab95866848466dc72820fa89
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/tools/testcon/mainwindow.cpp b/tools/testcon/mainwindow.cpp
index e4587be..98550ab 100644
--- a/tools/testcon/mainwindow.cpp
+++ b/tools/testcon/mainwindow.cpp
@@ -76,9 +76,9 @@ MainWindow::MainWindow(QWidget *parent)
     , m_dlgAmbient(Q_NULLPTR)
     , m_scripts(Q_NULLPTR)
 {
-    MainWindow::m_instance = this;
-
     setupUi(this);
+    MainWindow::m_instance = this; // Logging handler needs the UI
+
     setObjectName(QLatin1String("MainWindow"));
 
     const int scriptCount = int(sizeof(scriptLanguages) / sizeof(scriptLanguages[0]));