Combine requestFileSuccess arguments into `opts`

See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6149#note_14830172

app/assets/javascripts/blob/template_selector.js

@@ -72,14 +72,17 @@
     // To be implemented on the extending class
     // e.g.
     // Api.gitignoreText item.name, @requestFileSuccess.bind(@)
-    TemplateSelector.prototype.requestFileSuccess = function(file, skipFocus, append) {
+    TemplateSelector.prototype.requestFileSuccess = function(file, opts) {
       var oldValue = this.editor.getValue();
       var newValue = file.content;
-      if (append && oldValue.length && oldValue !== newValue) {
+      if (opts == null) {
+        opts = {};
+      }
+      if (opts.append && oldValue.length && oldValue !== newValue) {
         newValue = oldValue + '\n\n' + newValue;
       }
       this.editor.setValue(newValue, 1);
-      if (!skipFocus) this.editor.focus();
+      if (!opts.skipFocus) this.editor.focus();
       if (this.editor instanceof jQuery) {
         this.editor.get(0).dispatchEvent(this.autosizeUpdateEvent);

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

@@ -38,12 +38,12 @@
       // 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 2nd
-        // argument to `requestFileSuccess`.
-        this.requestFileSuccess(this.currentTemplate, true, append);
+        // skip focusing the description input by setting `true` as the
+        // `skipFocus` option to `requestFileSuccess`.
+        this.requestFileSuccess(this.currentTemplate, {skipFocus: true, append});
         this.titleInput.focus();
       } else {
-        this.requestFileSuccess(this.currentTemplate, false, append);
+        this.requestFileSuccess(this.currentTemplate, {skipFocus: false, append});
       }
       return;
     }