[kmail2] [Bug 414924] New: Distorted window on Hidpi Screen

[Stephan Johach]

https://bugs.kde.org/show_bug.cgi?id=414924

            Bug ID: 414924
           Summary: Distorted window on Hidpi Screen
           Product: kmail2
           Version: 5.12.3
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: hunsum at gmx.de
  Target Milestone: ---

Created attachment 124358
  --> https://bugs.kde.org/attachment.cgi?id=124358&action=edit
kmail 2 distorted main window on hidpi screen

SUMMARY

This is a multi-monitor setup

Primary Monitor: Eizo EV2785 3840x2160
Secondary Montor: Eizo S1910 1280x1024

Scaling factor is set to: 1.5

STEPS TO REPRODUCE
1.  Start KMail on the primary screen, in fullscreen the window 
is distorted (see screenshot kmail2_distorted_hidpi.png), resizing leads
to more distortion.
2.  Move the window to the secondary screen and double click to maximize it.
The distortion goes away (see kmail2_secondary_screen).
3. Moving it back to the primary screen leaves the layout exactly as on the
secondary screen, only scaled to the higher resolution (smaller).
4. Resizing or maximizing the window again (on the primary display) gets the
distortion back. The Kmail window seems to be cut off on the left and the
date part of the message list is repeated on the right.

OBSERVED RESULT

Distorted window on the hidpi screen. Undistorted window on the secondary
display.

EXPECTED RESULT

Undistorted window on both screens

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: gentoo
(available in About System)
KDE Plasma Version: 5.16.5
KDE Frameworks Version: 5.64
Qt Version: 5.12.5

ADDITIONAL INFORMATION
X Server
Radeon RX 560 Series (POLARIS11, DRM 3.33.0, 5.3.11-gentoo, LLVM 8.0.1)
OpenGL version: 4.5 (Compatibility Profile) Mesa 19.1.8
Kernel module: amdgpu

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