Core: Use QElapsedTimer instead of QTime

Avoids deprecation warning.

Change-Id: Ia4858235184369df1ba5d80c5eca71df53287bce
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/outputwindow.h

@@ -30,9 +30,9 @@
 
 #include <utils/outputformat.h>
 
+#include <QElapsedTimer>
 #include <QPlainTextEdit>
 #include <QTimer>
-#include <QTime>
 
 namespace Utils { class OutputFormatter; }
 
@@ -100,7 +100,7 @@ protected:
 private:
     using QPlainTextEdit::setFont; // call setBaseFont instead, which respects the zoom factor
     QTimer m_scrollTimer;
-    QTime m_lastMessage;
+    QElapsedTimer m_lastMessage;
     void enableUndoRedo();
     QString doNewlineEnforcement(const QString &out);
     void filterNewContent();