Allow east region to layout
Fixes #11438: Make OnFileManagerBeforeUpload event selectable
Remove unnecessary shadow "DOM"
Allow east region to layout

* origin/pr/11440:
  Allow east region to layout
Remove unnecessary shadow "DOM"

* origin/pr/11443:
  Remove unnecessary shadow "DOM"
Make OnFileManagerBeforeUpload event selectable

* origin/pr/11441:
  Fixes #11438: Make OnFileManagerBeforeUpload event selectable