'uploadWidgetDefinition.onAbort' method is not called when loader is aborted

[f1ames]

Are you reporting a feature request or a bug?

Bug

Provide detailed reproduction steps (if any)

According to SDK there are few on* methods in uploadWidgetDefinition which are fired when loader status changes.

However, even if onAbort is defined in uploadWidgetDefinition it is not fired when upload is aborted (widget removed or editor switched to Source mode during upload).

Quick reproduction steps

1. Go to https://sdk.ckeditor.com/samples/fileupload.html.
2. Paste in the browser dev console:

CKEDITOR.instances.editor2.widgets.registered.uploadimage.onAbort = function() { console.log( 'abort' ) }

3. Drop image into second editor on page.
4. Delete image widget or switch to source mode during upload.

Proper reproduction steps

uploadWidgetDefinition containing onAbort method is needed. Easy way may be to adjust uploadimage plugin (by adding onAbort method) and then test it on e.g. /tests/plugins/uploadwidget/manual/image2 manual test.

Expected result

onAbort method from uploadWidgetDefinition is fired when uploading aborted.

Actual result

onAbort method from uploadWidgetDefinition is not fired when uploading aborted.

Other details

• Browser: All (tested on Chrome and FF)
• OS: All
• CKEditor version: -
• Installed CKEditor plugins: uploadwidget