https://bugs.kde.org/show_bug.cgi?id=470185

            Bug ID: 470185
           Summary: Maximized windows not covering entire screen in some
                    circumstances
    Classification: Plasma
           Product: kwin
           Version: 5.27.5
          Platform: Kubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: 09_strays_fli...@icloud.com
  Target Milestone: ---

Created attachment 159215
  --> https://bugs.kde.org/attachment.cgi?id=159215&action=edit
Screen shot demonstrating the issue.  Look at the bottom row of pixels.  It is
a web page in Firefox, "behind" Dolphin.

STEPS TO REPRODUCE
1. 4K display, 200% DPI scaling.
2. Bottom panel set to "auto hide".
3. Launch Dolphin application and maximize the window.

OBSERVED RESULT
Dolphin covers the entire screen... minus the bottom row of pixels.  (See
screen shot, attached.)

EXPECTED RESULT
Dolphin should cover the entire screen.

Note that snapping a window to the left or right half of the screen (i.e.
Super+left arrow) does result in it covering that bottom row of pixelsproperly.
 Also, this issue appears to be specific to Qt applications?  Dolphin, Kate,
Konsole, and VLC will leave a row of pixels at the bottom.  Firefox,
Thunderbird, Visual Studio Code and Google Earth do not.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.8

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