Work around missing default button

Task-number: QTBUG-39334
Change-Id: Ib72e15f51dc86bea4f457375746d3438291eb679
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/coreplugin/dialogs/readonlyfilesdialog.cpp

@@ -236,7 +236,8 @@ void ReadOnlyFilesDialog::promptFailWarning(const QStringList &files, ReadOnlyRe
         message += tr("See details for a complete list of files.");
         details = files.join(QLatin1String("\n"));
     }
-    QMessageBox msgBox(QMessageBox::Warning, title, message);
+    QMessageBox msgBox(QMessageBox::Warning, title, message,
+                       QMessageBox::Ok, ICore::dialogParent());
     msgBox.setDetailedText(details);
     msgBox.exec();
 }

src/plugins/coreplugin/mimetypesettings.cpp

@@ -169,9 +169,9 @@ void MimeTypeSettingsModel::validatePatterns(QStringList *candidates,
     }
 
     if (!duplicates.isEmpty()) {
-        QMessageBox msgBox;
-        msgBox.setWindowTitle(tr("Invalid MIME Type"));
-        msgBox.setText(tr("Conflicting pattern(s) will be discarded."));
+        QMessageBox msgBox(QMessageBox::NoIcon, tr("Invalid MIME Type"),
+                           tr("Conflicting pattern(s) will be discarded."),
+                           QMessageBox::Ok, ICore::dialogParent());
         msgBox.setInformativeText(tr("%n pattern(s) already in use.", 0, duplicates.size()));
         msgBox.setDetailedText(duplicates.join(QLatin1String("\n")));
         msgBox.exec();