Insert a widget at a given index

Insert a input field to the Dynamic form, before
the specified index

#6406
Add @author and @since

Add @author and @since

#6406
Add @author, and @since

Add @author, and @since

#6406
Merge pull request #243 from A24Group/feature-agency-edit-timesheet-intervals-ui-6406

Insert a widget at a given index
Merge remote-tracking branch 'origin/master' into feature-firefox-datagrid-headers-filter-2674
Fix additional sort when clicking filter icon

Fix additional sort happening when clicking the
filter icon on firefox.

#2674