Folder input drag and drop not finding files in a folder

[MarkGooding]

Prerequisites

• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• The issue still exists against the latest master branch of bootstrap-fileinput.
• This is not an usage question. I confirm having read the plugin documentation and demos.
• This is not a general programming / coding question. (Those should be directed to the webtips Q & A forum).
• I have attempted to find the simplest possible steps to reproduce the issue.
• I have included a failing test as a pull request (Optional).

Steps to reproduce the issue

1. Using Chrome 131.0.6778.109 with developer tools open
2. Following example on https://plugins.krajee.com/file-folder-upload-demo for folder upload using ajax
3. Upload a folder

Expected behavior and actual behavior

When I follow those steps, the files are not added to the drag and drop preview. Chrome developer tools console reads:
Uncaught ReferenceError: i is not defined
at a._addFilesFromSystem (fileinput.min.js?ver=202206191928:11:55410)
at a._zoneDrop (fileinput.min.js?ver=202206191928:11:55633)
at HTMLDivElement.i (jquery-3.7.1.min.js:2:86755)
at HTMLDivElement.dispatch (jquery-3.7.1.min.js:2:40035)
at v.handle (jquery-3.7.1.min.js:2:38006)

I was expecting the files to be added to the preview for upload

Environment

Browsers

• Google Chrome (131.0.6778.109)
• Mozilla Firefox
• Internet Explorer
• Safari

Operating System

• Windows
• Mac OS X
• Linux
• Mobile

Libraries

• jQuery version: 3.7.1
• bootstrap-fileinput version: 5.5.4 & master

Isolating the problem

• This bug happens on the plugin demos page https://plugins.krajee.com/file-folder-upload-demo
• The bug happens consistently across all tested browsers
• This bug happens when using bootstrap-fileinput without other plugins
• I can reproduce this bug in a jsbin

[kartik-v]

Resolved via #1877.