[konsole] [Bug 403911] New: Background is visible through 1-pixel "cracks" on 4K display

[Alexey Neyman]

https://bugs.kde.org/show_bug.cgi?id=403911

            Bug ID: 403911
           Summary: Background is visible through 1-pixel "cracks" on 4K
                    display
           Product: konsole
           Version: 18.04.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: stilor at att.net
  Target Milestone: ---

Created attachment 117819
  --> https://bugs.kde.org/attachment.cgi?id=117819&action=edit
Screenshot

SUMMARY

See the attached screenshot - there are two 1-pixel bright blue vertical lines
on the right, near the scroll back + 1 horizontal line at the bottom, between
the Konsole's window and the panel. These 1-pixel lines are actually desktop's
background image showing through the Konsole window. One of the vertical lines
(left one) is sometimes repainted black - but a scroll-up in history brings it
back. I am not sure if it is konsole's bug or window manager's - please
reclassify if necessary.

I don't see this issue on a 1920x1080 screen, only on 3840x2160 - which makes
me think there is a rounding error somewhere...

STEPS TO REPRODUCE
1. Install Kubuntu on a system with 4K screen
2. Run Konsole and maximize the window
3. Observe 

OBSERVED RESULT

1-pixel wide lines of background image inside Konsole's window.


EXPECTED RESULT

Konsole's window covering the whole window's area.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 18.10, Konsole 18.04.3, 
(available in About System)
KDE Plasma Version: 5.13.5
KDE Frameworks Version: 5.50.0
Qt Version: 5.11.1

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