Iconic preview isn't working for uppercase extensions

[Roluc]

• 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.

1. Upload two images one with an uppercase extension, the other one lowercase
   

Only the lowercase extension will be displayed as iconic preview...

I saw on line 938 - 941 that you are checking for an iconic template against the 'previewFileIconSettings':
ext = fname.split('.').pop();
if (self.previewFileIconSettings && self.previewFileIconSettings[ext]) {
out = self.previewFileIconSettings[ext];
}

The templates are maintained in lowercase, so it won't find an iconic template for uppercase extensions. Maybe the extension should be transformed to lowercase before retrieving the template, so the iconic preview also works for uppercase extensions.

Thanks in advance

Libraries

• jQuery version: 1.11.4
• bootstrap-fileinput version: 4.4.0