I have a content with a three level repeater.
The thrid repeater contains a file metadata.

In solr tool, I choose the column of my repeater to do able to edit it in the grid.

I open my repeater until the third level an try to edit the file metadata.
The file widget is correctly displayed.
I click on cross to delete the file.

The dialog box to confirm deletion, is dosplayed but disappears immediately.
In fact the confirm dialog is behind the repeater dialog box.

In File.js I comment this.triggerDialogBoxOpened = true; at line 480, the zindex of the confirm box is ok, but the widget lost its focus.