Add todo

sksurgerydavinci/widgets/Viewers.py

@@ -94,6 +94,7 @@ class MonoViewer(QtWidgets.QWidget):
 
     def on_crop_clicked(self):
         """ Crop the incoming video stream using ImageCropper. """
+        #TODO: Exit button disappearing before able to click?!?
         roi = ImageCropper().crop(self.overlay_window.img)
         self.overlay_window.set_roi(roi)