https://bugs.kde.org/show_bug.cgi?id=381163

            Bug ID: 381163
           Summary: katepart shows stripes in selected text when source
                    code highlighting is enabled and thus text is colored
           Product: kate
           Version: 17.04.2
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: part
          Assignee: kwrite-bugs-n...@kde.org
          Reporter: marcus.behrendt...@gmail.com
  Target Milestone: ---

Created attachment 106083
  --> https://bugs.kde.org/attachment.cgi?id=106083&action=edit
comparision of disabled highlighting and enabled highlighting

This happens in all applications that use katepart4 and katepart5 (kate,
kwrite, kdevelop, kile, ...). When I open kate source code highlighting is
initially switched off. Now when I type some text (may be a Java class) and
then select this text, no stripes are visible in the selection. But when I
switch to some highlighting (in this case Java, but doesn't matter) and after
that select the text again, one can see vertical white stripes in the
selection. The stripes occur randomly before and after words. Now, even if I
switch off highlighting, the stripes aren't going to disappear. I have to
restart the application to get rid off them. 
Besides Arch I could reproduce it in KDE Neon. I tried with modesetting driver
and intel xorg driver (SNA, UXA, DRI2, DRI3) but the problem persists. On
reddit one user could also reproduce it on a RadeonSI system
(https://www.reddit.com/r/kde/comments/6gm2wo/kate_shows_ugly_stripes_in_selection_when_text_is/diuaes8/).

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