don't hide cell toolbar on rendered text cells

because it annoys @Carreau

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

@@ -280,7 +280,7 b' define(['
         }
 
         // If there are no controls or the cell is a rendered TextCell hide the toolbar.
-        if (!this.ui_controls_list.length || (this.cell.cell_type != 'code' && this.cell.rendered)) {
+        if (!this.ui_controls_list.length) {
             this.hide();
         } else {
             this.show();

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

@@ -137,9 +137,6 b' define(['
             }
             this.refresh();
         }
-        if (this.celltoolbar.ui_controls_list.length) {
-            this.celltoolbar.show();
-        }
         return cont;
     };
 
@@ -180,7 +177,6 b' define(['
      */
     TextCell.prototype.set_rendered = function(text) {
         this.element.find('div.text_cell_render').html(text);
-        this.celltoolbar.hide();
     };