Updated docs. Added debug output info for tracing problem related to server communications.

common/static/js/capa/drag_and_drop/update_input.js

@@ -50,6 +50,7 @@ define(['logme'], function (logme) {
             }(0));
         }
 
+        logme('input = "' + JSON.stringify({'draggables': draggables}) + '".');
         $('#input_' + state.problemId).val(JSON.stringify({'draggables': draggables}));
     }
 

docs/source/drag_and_drop_input.rst

@@ -215,8 +215,11 @@ If we have can_reuse=true, than one must use only long form of correct answer.
 Logic flow
 ----------
 
+(Click on image to see full size version.)
+
 .. image:: draganddrop_logic_flow.png
-    :scale: 36 %
+    :width: 100%
+    :target: _images/draganddrop_logic_flow.png
 
 
 Example