Debugger: Use Core::AsynchronousMessageBox

Nested event loops can lead to crashes, so it is better to use a dialog
which does not have have its own event loop.

Change-Id: Icd2390c9026bc1ef88e72a570df5813fe5cbdaa2
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/memoryagent.cpp

@@ -40,13 +40,12 @@
 #include <coreplugin/coreconstants.h>
 #include <coreplugin/editormanager/ieditor.h>
 #include <coreplugin/editormanager/editormanager.h>
+#include <coreplugin/messagebox.h>
 
 #include <utils/qtcassert.h>
 #include <extensionsystem/pluginmanager.h>
 #include <extensionsystem/invoker.h>
 
-#include <QMessageBox>
-
 #include <cstring>
 
 using namespace Core;
@@ -197,7 +196,7 @@ void MemoryAgent::createBinEditor(quint64 addr, unsigned flags,
                                   const QString &title, QWidget *parent)
 {
     if (!doCreateBinEditor(addr, flags, ml, pos, title, parent))
-        showMessageBox(QMessageBox::Warning,
+        Core::AsynchronousMessageBox::warning(
             tr("No Memory Viewer Available"),
             tr("The memory contents cannot be shown as no viewer plugin "
                "for binary data has been loaded."));