BUG:373777 Add the Volumes folder to the file dialog sidebar on OSX

That way, people can access all their disks more easily.

libs/widgetutils/KoFileDialog.cpp

@@ -140,6 +140,16 @@ void KoFileDialog::createFileDialog()
     d->fileDialog->setOption(QFileDialog::DontConfirmOverwrite, false);
     d->fileDialog->setOption(QFileDialog::HideNameFilterDetails, true);
 
+#ifdef Q_OS_OSX
+    QList<QUrl> urls = d->fileDialog->sidebarUrls();
+    QUrl volumes = QUrl::fromLocalFile("\/Volumes");
+    if (!urls.contains(volumes)) {
+        urls.append(volumes);
+    }
+
+    d->fileDialog->setSidebarUrls(urls);
+#endif
+
     if (d->type == SaveFile) {
         d->fileDialog->setAcceptMode(QFileDialog::AcceptSave);
         d->fileDialog->setFileMode(QFileDialog::AnyFile);