https://bugs.kde.org/show_bug.cgi?id=388239

            Bug ID: 388239
           Summary: kate long line wrapping only works after restart
           Product: kate
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: application
          Assignee: kwrite-bugs-n...@kde.org
          Reporter: krichter...@aol.de
  Target Milestone: ---

Created attachment 109524
  --> https://bugs.kde.org/attachment.cgi?id=109524&action=edit
allows to reproduce (open in another editor and paste into kate)

When creating extremely long lines in `kate` (most likely through pasting), the
view jumps to the end of the line when scrolling down and to the beginning when
scrolling up which makes it impossible to read the middle. This issues is
avoided after a restart when `kate` provides a view with line breaks (and an
option to save it).

The scrolling shouldn't be different for long lines because not only the
skipping of the middle part is an issue, but the jumping of the scroll interval
as well.

A possible use case is pasting web server integration test logs containing
base64-encoded screenshot which are ready to run on a headless CI server. A few
100 KB in one base64-encoded line can easily have a few million characters.
Even it the use case is rare, `kate` should be capable of handling it.

experienced with 17.08.3 on Kubuntu 18.04-daily

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