Multiple images upload

[Lapinskas]

I've faced the problem of multiple images upload and resulted in quick workaround. Please take more detailed view on this problem and eventually fix the multiple images upload functionality.

Problem:

1. Current licensed version of WYSIWYG Redactor by Imperavi is version dated October 2015 (really old and outdated, please consider getting a fresh one!).
2. Redactor supports multipleImageUpload setting only starting from version 1.2 dated December 16th, 2015

Workaround: I've found the problematic place in the redactor.js file

                onDrop: function (e) {
                    e = e.originalEvent || e;
                    var files = e.dataTransfer.files;

                    this.upload.traverseFile(files[0], e);

As you can see, only the first image will be uploaded, as it is hardcoded files[0] in the JavaScript. There are more similar hardcoded files[0] fragments.

So, small change to have a loop on all images helped me to solve the problem:

                onDrop: function (e) {
                    e = e.originalEvent || e;
                    var files = e.dataTransfer.files;

                    for (var index = 0; index < files.length; ++index) {
                        this.upload.traverseFile(files[index], e);
                    }

Now user can drop multiple files to the upload box and it works fine, except of progress bar that works incorrectly.

PS. No changes are needed on PHP side