corrected some semantics

ui/viewerwidget.cpp

@@ -44,8 +44,8 @@ ViewerWidget::ViewerWidget(QWidget *parent) :
 	format.setDepthBufferSize(24);
 	setFormat(format);
 
-	// error handler - retries after 500ms if we couldn't get the entire image
-	retry_timer.setInterval(500);
+    // error handler - retries after 50ms if we couldn't get the entire image
+    retry_timer.setInterval(50);
 	connect(&retry_timer, SIGNAL(timeout()), this, SLOT(retry()));
 
 	setContextMenuPolicy(Qt::CustomContextMenu);
@@ -137,7 +137,7 @@ void ViewerWidget::mouseMoveEvent(QMouseEvent* event) {
 		} else {
 			QDrag* drag = new QDrag(this);
 			QMimeData* mimeData = new QMimeData;
-			mimeData->setText("h");
+            mimeData->setText("h"); // QMimeData will fail without some kind of data
 			drag->setMimeData(mimeData);
 			drag->exec();
 		}