Don't always call focus_cell in Cell.command_mode.

The focus_cell should only be called when a user enters
command mode by pressing ESC. Calling focus_cell was causing
jumps when command mode was entered through a mouse click.

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

@@ -368,14 +368,6 @@ var IPython = (function (IPython) {
         return false;
     };
 
-    CodeCell.prototype.command_mode = function () {
-        var cont = IPython.Cell.prototype.command_mode.apply(this);
-        if (cont) {
-            this.focus_cell();
-        };
-        return cont;
-    }
-
     CodeCell.prototype.edit_mode = function () {
         var cont = IPython.Cell.prototype.edit_mode.apply(this);
         if (cont) {

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

@@ -131,6 +131,7 @@ var IPython = (function (IPython) {
             help    : 'command mode',
             handler : function (event) {
                 IPython.notebook.command_mode();
+                IPython.notebook.focus_cell();
                 return false;
             }
         },
@@ -138,6 +139,7 @@ var IPython = (function (IPython) {
             help    : 'command mode',
             handler : function (event) {
                 IPython.notebook.command_mode();
+                IPython.notebook.focus_cell();
                 return false;
             }
         },

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

@@ -547,6 +547,11 @@ var IPython = (function (IPython) {
         };
     };
 
+    Notebook.prototype.focus_cell = function () {
+        var cell = this.get_selected_cell();
+        if (cell === null) {return;}  // No cell is selected
+        cell.focus_cell();
+    };
 
     // Cell movement
 

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

@@ -204,14 +204,6 @@ var IPython = (function (IPython) {
         this.render();
     };
 
-    TextCell.prototype.command_mode = function () {
-        var cont = IPython.Cell.prototype.command_mode.apply(this);
-        if (cont) {
-            this.focus_cell();
-        };
-        return cont;
-    }
-
     TextCell.prototype.edit_mode = function () {
         var cont = IPython.Cell.prototype.edit_mode.apply(this);
         if (cont) {