Preserve nbformat_minor from the future

warn on click of unrecognized elements, rather than on load.

IPython/html/static/notebook/js/cell.js

@@ -636,7 +636,7 b' define(['
         } else {
             data.metadata = this.metadata;
         }
-        this.element.find('.inner_cell').text("Unrecognized cell type: " + data.cell_type);
+        this.element.find('.inner_cell').find("a").text("Unrecognized cell type: " + data.cell_type);
     };
     
     UnrecognizedCell.prototype.create_element = function () {
@@ -647,10 +647,23 b' define(['
         var prompt = $('<div/>').addClass('prompt input_prompt');
         cell.append(prompt);
         var inner_cell = $('<div/>').addClass('inner_cell');
-        inner_cell.text("Unrecognized cell type");
+        inner_cell.append(
+            $("<a>")
+                .attr("href", "#")
+                .text("Unrecognized cell type")
+        );
         cell.append(inner_cell);
         this.element = cell;
     };
+    
+    UnrecognizedCell.prototype.bind_events = function () {
+        Cell.prototype.bind_events.apply(this, arguments);
+        var cell = this;
+        
+        this.element.find('.inner_cell').find("a").click(function () {
+            cell.events.trigger('unrecognized_cell.Cell', {cell: cell})
+        });
+    };
 
     // Backwards compatibility.
     IPython.Cell = Cell;

IPython/html/static/notebook/js/notebook.js

@@ -147,7 +147,7 b' define(['
         this.minimum_autosave_interval = 120000;
         this.notebook_name_blacklist_re = /[\/\\:]/;
         this.nbformat = 4; // Increment this when changing the nbformat
-        this.nbformat_minor = 0; // Increment this when changing the nbformat
+        this.nbformat_minor = this.current_nbformat_minor = 0; // Increment this when changing the nbformat
         this.codemirror_mode = 'ipython';
         this.create_elements();
         this.bind_events();
@@ -207,6 +207,14 b' define(['
             that.dirty = true;
         });
 
+        this.events.on('unrecognized_cell.Cell', function () {
+            that.warn_nbformat_minor();
+        });
+
+        this.events.on('unrecognized_output.OutputArea', function () {
+            that.warn_nbformat_minor();
+        });
+
         this.events.on('set_dirty.Notebook', function (event, data) {
             that.dirty = data.value;
         });
@@ -300,6 +308,28 b' define(['
             return null;
         };
     };
+    
+    Notebook.prototype.warn_nbformat_minor = function (event) {
+        // trigger a warning dialog about missing functionality from newer minor versions
+        var v = 'v' + this.nbformat + '.';
+        var orig_vs = v + this.nbformat_minor;
+        var this_vs = v + this.current_nbformat_minor;
+        var msg = "This notebook is version " + orig_vs + ", but we only fully support up to " +
+        this_vs + ".  You can still work with this notebook, but cell and output types " +
+        "introduced in later notebook versions will not be available.";
+
+        dialog.modal({
+            notebook: this,
+            keyboard_manager: this.keyboard_manager,
+            title : "Newer Notebook",
+            body : msg,
+            buttons : {
+                OK : {
+                    "class" : "btn-danger"
+                }
+            }
+        });
+    }
 
     /**
      * Set the dirty flag, and trigger the set_dirty.Notebook event
@@ -2234,26 +2264,8 b' define(['
                     }
                 }
             });
-        } else if (orig_nbformat_minor !== undefined && nbmodel.nbformat_minor < orig_nbformat_minor) {
-            var that = this;
-            var orig_vs = 'v' + nbmodel.nbformat + '.' + orig_nbformat_minor;
-            var this_vs = 'v' + nbmodel.nbformat + '.' + this.nbformat_minor;
-            msg = "This notebook is version " + orig_vs + ", but we only fully support up to " +
-            this_vs + ".  You can still work with this notebook, but some features " +
-            "introduced in later notebook versions may not be available.";
-
-            dialog.modal({
-                notebook: this,
-                keyboard_manager: this.keyboard_manager,
-                title : "Newer Notebook",
-                body : msg,
-                buttons : {
-                    OK : {
-                        class : "btn-danger"
-                    }
-                }
-            });
-
+        } else if (this.nbformat_minor < nbmodel.nbformat_minor) {
+            this.nbformat_minor = nbmodel.nbformat_minor;
         }
         
         // Create the session after the notebook is completely loaded to prevent

IPython/html/static/notebook/js/outputarea.js

@@ -271,7 +271,6 b' define(['
         }
 
         var record_output = true;
-        console.log("appending", json);
         switch(json.output_type) {
             case 'execute_result':
                 json = this.validate_mimebundle(json);
@@ -490,10 +489,18 b' define(['
 
 
     OutputArea.prototype.append_unrecognized = function (json) {
+        var that = this;
         var toinsert = this.create_output_area();
         var subarea = $('<div/>').addClass('output_subarea output_unrecognized');
         toinsert.append(subarea);
-        subarea.text("Unrecognized output: " + json.output_type);
+        subarea.append(
+            $("<a>")
+                .attr("href", "#")
+                .text("Unrecognized output: " + json.output_type)
+                .click(function () {
+                    that.events.trigger('unrecognized_output.OutputArea', {output: json})
+                })
+        );
         this._safe_append(toinsert);
     };
 

IPython/html/static/notebook/less/cell.less

@@ -74,6 +74,16 b' div.unrecognized_cell {'
         color: red;
         border: 1px solid @light_border_color;
         background: darken(@cell_background, 5%);
+        // remove decoration from link
+        a {
+            color: inherit;
+            text-decoration: none;
+
+            &:hover {
+                color: inherit;
+                text-decoration: none;
+            }
+        }
     }
 }
 @media (max-width: 480px) {

IPython/html/static/notebook/less/outputarea.less

@@ -177,4 +177,14 b' div.output_unrecognized {'
   padding: 5px;
   font-weight: bold;
   color: red;
+  // remove decoration from link
+  a {
+      color: inherit;
+      text-decoration: none;
+
+      &:hover {
+          color: inherit;
+          text-decoration: none;
+      }
+  }
 }
  No newline at end of file

IPython/html/static/style/ipython.min.css

@@ -444,6 +444,14 b' div.unrecognized_cell .inner_cell {'
   border: 1px solid #cfcfcf;
   background: #eaeaea;
 }
+div.unrecognized_cell .inner_cell a {
+  color: inherit;
+  text-decoration: none;
+}
+div.unrecognized_cell .inner_cell a:hover {
+  color: inherit;
+  text-decoration: none;
+}
 @media (max-width: 480px) {
   div.unrecognized_cell > div.prompt {
     display: none;
@@ -919,11 +927,18 b' p.p-space {'
   margin-bottom: 10px;
 }
 div.output_unrecognized {
-  border-radius: 4px;
   padding: 5px;
   font-weight: bold;
   color: red;
 }
+div.output_unrecognized a {
+  color: inherit;
+  text-decoration: none;
+}
+div.output_unrecognized a:hover {
+  color: inherit;
+  text-decoration: none;
+}
 .rendered_html {
   color: #000000;
   /* any extras will just be numbers: */

IPython/html/static/style/style.min.css

@@ -8313,6 +8313,14 b' div.unrecognized_cell .inner_cell {'
   border: 1px solid #cfcfcf;
   background: #eaeaea;
 }
+div.unrecognized_cell .inner_cell a {
+  color: inherit;
+  text-decoration: none;
+}
+div.unrecognized_cell .inner_cell a:hover {
+  color: inherit;
+  text-decoration: none;
+}
 @media (max-width: 480px) {
   div.unrecognized_cell > div.prompt {
     display: none;
@@ -8788,11 +8796,18 b' p.p-space {'
   margin-bottom: 10px;
 }
 div.output_unrecognized {
-  border-radius: 4px;
   padding: 5px;
   font-weight: bold;
   color: red;
 }
+div.output_unrecognized a {
+  color: inherit;
+  text-decoration: none;
+}
+div.output_unrecognized a:hover {
+  color: inherit;
+  text-decoration: none;
+}
 .rendered_html {
   color: #000000;
   /* any extras will just be numbers: */