Removed append logic

Updated test

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

@@ -68,14 +68,10 @@
       // To be implemented on the extending class
       // e.g.
       // Api.gitignoreText item.name, @requestFileSuccess.bind(@)
-      requestFileSuccess(file, { skipFocus, append } = {}) {
+      requestFileSuccess(file, { skipFocus } = {}) {
         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();
 
@@ -99,4 +95,3 @@
 
     global.TemplateSelector = TemplateSelector;
   })(window.gl || ( window.gl = {}));
-

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

@@ -32,24 +32,22 @@
         this.currentTemplate = currentTemplate;
         if (err) return; // Error handled by global AJAX error handler
         this.stopLoadingSpinner();
-        this.setInputValueToTemplateContent(true);
+        this.setInputValueToTemplateContent();
       });
       return;
     }
 
-    setInputValueToTemplateContent(append) {
+    setInputValueToTemplateContent() {
       // `this.requestFileSuccess` sets the value of the description input field
-      // to the content of the template selected. If `append` is true, the
+      // to the content of the template selected.
-      // template content will be appended to the previous value of the field,
-      // separated by a blank line if the previous value is non-empty.
       if (this.titleInput.val() === '') {
         // If the title has not yet been set, focus the title input and
         // skip focusing the description input by setting `true` as the
         // `skipFocus` option to `requestFileSuccess`.
-        this.requestFileSuccess(this.currentTemplate, {skipFocus: true, append});
+        this.requestFileSuccess(this.currentTemplate, {skipFocus: true});
         this.titleInput.focus();
       } else {
-        this.requestFileSuccess(this.currentTemplate, {skipFocus: false, append});
+        this.requestFileSuccess(this.currentTemplate, {skipFocus: false});
       }
       return;
     }

spec/features/projects/issuable_templates_spec.rb

@@ -77,7 +77,7 @@ feature 'issuable templates', feature: true, js: true do
     scenario 'user selects "bug" template' do
       select_template 'bug'
       wait_for_ajax
-      preview_template("#{prior_description}\n\n#{template_content}")
+      preview_template("#{template_content}")
       save_changes
     end
   end