Jump to last edited/active segment

The grid should automatically scroll to the last segment for the user, that currently is logged in in the following situations:

• on opening a task, scroll to the last edited segment (on task open, technically implemented by searching for latest segment modified by that user in the segment_history)
  • If there is no last edited segment and segment ranges are assigned to different users, then scroll to the first segment assigned to the current user
  • else scroll to the first editable segment
• on switching editor mode, scroll to the same segments, that have been visible before the switch (use last scroll position here, instead of last edited segment, so that the same area is visible again)
• on removing filter or sorting, scroll to the last edited segment (even if there is still a filter set in case before there had been more than one filter set; last edited segment can be stored in JS, no need to ask server)
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