numerous updates

static/filer/js/addons/dropzone.init.js

@@ -130,8 +130,11 @@ djQuery(function ($) {
                     event.preventDefault();
                 });
             },
-            error: function (file, response) {
-                showError(file.name + ': ' + response.error);
+            error: function (file, msg, response) {
+                if (response && response.error) {
+                    msg += ' ; ' + response.error;
+                }
+                showError(file.name + ': ' + msg);
                 this.removeAllFiles(true);
             },
             reset: function () {

static/filer/js/addons/popup_handling.js

@@ -33,6 +33,7 @@ if (django.jQuery) {
         element.val(chosenId);
         element.closest('.js-filer-dropzone').addClass('js-object-attached');
         image.attr('src', chosenThumbnailUrl).removeClass('hidden');
+        image.removeAttr('srcset');  // would be nicer, but much more complicate to also replace 'srcset'
         descriptionText.text(chosenDescriptionTxt);
         clearer.removeClass('hidden');
         lookup.addClass('related-lookup-change');

static/filer/js/addons/table-dropzone.js

@@ -199,14 +199,14 @@ if (django.jQuery) {
                             window.location.reload();
                         }
                     },
-                    error: function (file, errorText) {
+                    error: function (file, error) {
                         updateUploadNumber();
-                        if (errorText === 'duplicate') {
+                        if (error === 'duplicate') {
                             return;
                         }
                         hasErrors = true;
                         if (window.filerShowError) {
-                            window.filerShowError(file.name + ': ' + errorText);
+                            window.filerShowError(file.name + ': ' + error.message);
                         }
                     }
                 });

static/filer/js/base.js

@@ -36,7 +36,7 @@ Cl.mediator = new Mediator();
 
             showErrorTimeout = setTimeout(function () {
                 $('.' + filerErrorClass).remove();
-            }, 3000);
+            }, 5000);
         };
 
         // Focal point logic init