Modify cells converter funcs to keep metadata through

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

@@ -993,19 +993,21 define([
     Notebook.prototype.to_code = function (index) {
         var i = this.index_or_selected(index);
         if (this.is_valid_cell_index(i)) {
-            var source_element = this.get_cell_element(i);
-            var source_cell = source_element.data("cell");
+			var source_cell = this.get_cell(i);
             if (!(source_cell instanceof codecell.CodeCell)) {
                 var target_cell = this.insert_cell_below('code',i);
                 var text = source_cell.get_text();
                 if (text === source_cell.placeholder) {
                     text = '';
                 }
+				//metadata
+				target_cell.metadata = source_cell.metadata;
+
                 target_cell.set_text(text);
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 target_cell.code_mirror.clearHistory();
-                source_element.remove();
+                source_cell.element.remove();
                 this.select(i);
                 var cursor = source_cell.code_mirror.getCursor();
                 target_cell.code_mirror.setCursor(cursor);
@@ -1023,21 +1025,24 define([
     Notebook.prototype.to_markdown = function (index) {
         var i = this.index_or_selected(index);
         if (this.is_valid_cell_index(i)) {
-            var source_element = this.get_cell_element(i);
-            var source_cell = source_element.data("cell");
+			var source_cell = this.get_cell(i);
+
             if (!(source_cell instanceof textcell.MarkdownCell)) {
                 var target_cell = this.insert_cell_below('markdown',i);
                 var text = source_cell.get_text();
+
                 if (text === source_cell.placeholder) {
                     text = '';
                 }
+				// metadata
+				target_cell.metadata = source_cell.metadata
                 // We must show the editor before setting its contents
                 target_cell.unrender();
                 target_cell.set_text(text);
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 target_cell.code_mirror.clearHistory();
-                source_element.remove();
+                source_cell.element.remove();
                 this.select(i);
                 if ((source_cell instanceof textcell.TextCell) && source_cell.rendered) {
                     target_cell.render();
@@ -1058,22 +1063,24 define([
     Notebook.prototype.to_raw = function (index) {
         var i = this.index_or_selected(index);
         if (this.is_valid_cell_index(i)) {
-            var source_element = this.get_cell_element(i);
-            var source_cell = source_element.data("cell");
             var target_cell = null;
+			var source_cell = this.get_cell(i);
+
             if (!(source_cell instanceof textcell.RawCell)) {
                 target_cell = this.insert_cell_below('raw',i);
                 var text = source_cell.get_text();
                 if (text === source_cell.placeholder) {
                     text = '';
                 }
+				//metadata
+				target_cell.metadata = source_cell.metadata;
                 // We must show the editor before setting its contents
                 target_cell.unrender();
                 target_cell.set_text(text);
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 target_cell.code_mirror.clearHistory();
-                source_element.remove();
+                source_cell.element.remove();
                 this.select(i);
                 var cursor = source_cell.code_mirror.getCursor();
                 target_cell.code_mirror.setCursor(cursor);
@@ -1093,9 +1100,9 define([
         level = level || 1;
         var i = this.index_or_selected(index);
         if (this.is_valid_cell_index(i)) {
-            var source_element = this.get_cell_element(i);
-            var source_cell = source_element.data("cell");
+			var source_cell = this.get_cell(i);
             var target_cell = null;
+
             if (source_cell instanceof textcell.HeadingCell) {
                 source_cell.set_level(level);
             } else {
@@ -1104,6 +1111,8 define([
                 if (text === source_cell.placeholder) {
                     text = '';
                 }
+				//metadata
+				target_cell.metadata = source_cell.metadata;
                 // We must show the editor before setting its contents
                 target_cell.set_level(level);
                 target_cell.unrender();
@@ -1111,7 +1120,7 define([
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 target_cell.code_mirror.clearHistory();
-                source_element.remove();
+                source_cell.element.remove();
                 this.select(i);
                 var cursor = source_cell.code_mirror.getCursor();
                 target_cell.code_mirror.setCursor(cursor);