Focus management

[exalate-issue-sync]

User story

As a user with screen reader I want the focus to go back to the emitting element after I closed a modal, so that I can continue to work where I came from.
As a power user I would like focussable elements to have a meaningful order when navigating with TABs, so that I can work in an efficient manner.
As a user with visual impairment I want the focus to go to the next element when I delete an element, so that I don't have to start over with my keyboard navigation.

Acceptance criteria

• never lose keyboard focus
• meaningful order of focussable elements
• always stay in context / resume old context