Restore inexplicably removed code from requestFileSuccess.

(also clean up a few global refs)

app/assets/javascripts/blob/template_selector.js.es6

@@ -68,8 +68,15 @@
       // To be implemented on the extending class
       // e.g.
       // Api.gitignoreText item.name, @requestFileSuccess.bind(@)
-      requestFileSuccess(file, skipFocus) {
-        this.editor.setValue(file.content, 1);
+      requestFileSuccess(file, { skipFocus, append } = {}) {
+        const oldValue = this.editor.getValue();
+        let newValue = file.content;
+
+        if (append && oldValue.length && oldValue !== newValue) {
+          newValue = oldValue + '\n\n' + newValue;
+        }
+
+        this.editor.setValue(newValue, 1);
         if (!skipFocus) this.editor.focus();
 
         if (this.editor instanceof jQuery) {

app/assets/javascripts/dispatcher.js

@@ -59,7 +59,7 @@
           shortcut_handler = new ShortcutsNavigation();
           new GLForm($('.issue-form'));
           new IssuableForm($('.issue-form'));
-          new IssuableTemplateSelectors();
+          new gl.IssuableTemplateSelectors();
           break;
         case 'projects:merge_requests:new':
         case 'projects:merge_requests:edit':
@@ -67,7 +67,7 @@
           shortcut_handler = new ShortcutsNavigation();
           new GLForm($('.merge-request-form'));
           new IssuableForm($('.merge-request-form'));
-          new IssuableTemplateSelectors();
+          new gl.IssuableTemplateSelectors();
           break;
         case 'projects:tags:new':
           new ZenMode();

app/assets/javascripts/templates/issuable_template_selector.js.es6

@@ -50,4 +50,4 @@
   }
 
   global.IssuableTemplateSelector = IssuableTemplateSelector;
-})(window);
+})(window.gl || (window.gl = {}));

app/assets/javascripts/templates/issuable_template_selectors.js.es6

 ((global) => {
   class IssuableTemplateSelectors {
-    constructor(opts = {}) {
-      this.$dropdowns = opts.$dropdowns || $('.js-issuable-selector');
-      this.editor = opts.editor || this.initEditor();
+    constructor({ $dropdowns, editor } = {}) {
+      this.$dropdowns = $dropdowns || $('.js-issuable-selector');
+      this.editor = editor || this.initEditor();
 
       this.$dropdowns.each((i, dropdown) => {
-        let $dropdown = $(dropdown);
-        new IssuableTemplateSelector({
+        const $dropdown = $(dropdown);
+        new gl.IssuableTemplateSelector({
           pattern: /(\.md)/,
           data: $dropdown.data('data'),
           wrapper: $dropdown.closest('.js-issuable-selector-wrap'),
@@ -26,4 +26,4 @@
   }
 
   global.IssuableTemplateSelectors = IssuableTemplateSelectors;
-})(window);
+})(window.gl || (window.gl = {}));