fix: Edit button displayed twice in a shared file preview mode - EXO-…

…74839. (#2427)

Before this change, when open link of shared file in a new tab, two edit buttons are displayed in the opened preview page. To resolve this problem, make a condition on the edit button insertion to ensure that it is inserted only once. After this change, only one edit button is displayed and no reload page.

(cherry picked from commit 0e622c9)

apps/resources-wcm/src/main/webapp/javascript/eXo/ecm/document-preview.js

@@ -637,7 +637,9 @@
       if(!this.isDownloadStatusActivated && !documentPreview.defaultSettings.doc.isCloudDrive) {
         var editorButtonsLoader = editorbuttons.initPreviewButtons(this.settings.doc.id, this.settings.doc.workspace, 'dropup');
         editorButtonsLoader.done(function ($buttonsContainer) {
-          $(".previewBtn").append($buttonsContainer);
+          if ($(".previewBtn").find('.editorButtonContainer').length === 0){
+            $(".previewBtn").append($buttonsContainer);
+          }
         });
       }