[konsole] [Bug 418227] New: Screens scaling 150%: bad font rendering when moving konsole from laptop screen to extern 4k monitor

[Achim Bohnet]

https://bugs.kde.org/show_bug.cgi?id=418227

            Bug ID: 418227
           Summary: Screens scaling 150%:  bad font rendering when moving
                    konsole from laptop screen to extern 4k monitor
           Product: konsole
           Version: 19.12.2
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: ach at mpe.mpg.de
  Target Milestone: ---

Created attachment 126431
  --> https://bugs.kde.org/attachment.cgi?id=126431&action=edit
Laptop screen: fonts properly displayed

SUMMARY
setup: Lenovo X1 Carbon laptop with external 4K Monitor connected with USB-C
Dock
(see xrandr.out)

Wenn I move a konsole window to from laptop to external monitor the fonts are
distroted.

STEPS TO REPRODUCE
1. start konsole with Alt-Space on external monitor
2. alternatively: move konsole from laptop display to external monitor

OBSERVED RESULT
displayed fonts are too big for the row/column spacing (see
konsole.on-extern-4k.png)


EXPECTED RESULT
fonts should fit the row/colum spacing (see konsole.on-laptop-screen.png)


SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.18
KDE Plasma Version: 5.18.2
KDE Frameworks Version: 5.67.0
Qt Version: 5.14.1
Kernel Version: 5.3.0-40-generic
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-8565U CPU @ 1.80GHz
Memory: 15.4 GiB of RAM

ADDITIONAL INFORMATION:
1) Before with qt 5.12.? and Kde Apps 19.12.1 the font size was adapted to
row/column spacing -> so fonts where much too small on the external monitor
(kwin decoration didn't show this bug)

2) moving konsole window from external monitor to laptop monitor fixes the
fonts display problem

3) Using Ctrl-- & Ctrl-+ fixes adapts the row/colum spacing to the font size

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