Double Commander in Wayland, KDE Plasma 5 and 4K shows blurry text

[elman22]

When I run Double Commander in Wayland session in KDE Plasma 5 and use 4K display with scaling set to 200 %, all fonts are blurry (as with other application which do not support Wayland). Could you please add support for Wayland?

Double Commander 0.9.10 beta
Revision: 9640
Build: 2021/06/01
Lazarus: 2.0.12.0
Free Pascal: 3.2.2
Platform: x86_64-Linux-qt5
System: Manjaro Linux
Desktop Environment: KDE
Widgetset library: Qt 5.15.2, libQt5Pas 5.6.1

[alexx2000]

So it is XWayland bug. DC can work under Wayland if built it using Lazarus 2.2 and execute via:
doublecmd -platform wayland

[elman22]

Cool. Thanks for letting me know. I will try is as soon as Arch will use Lazarus 2.2 for build.

[altosch]

Hi, I have pretty much the same problem.

Double Commander 1.0.1 beta, revision 35
-> from official download site https://sourceforge.net/p/doublecmd/wiki/Download/
-> package doublecmd-1.0.1.qt.x86_64.tar.xz

I'm using KDE Neon 5.23, Qt 5.15.3, Wayland, Full HD 1920x1080, scale 150%.

It's blurry. On About screen I can see: Lazarus 2.0.12.0.

If I try to run it with -platform wayland it won't start and there is an error: "[FORMS.PP] ExceptionOccurred".
I take the Lazarus 2.2 is needed.

If I get it right Lazarus 2.2.0 is not yet released but it will be soon.
Can we hope that when it is released the official versions will be build with it?

[alexx2000]

Hi, yes.

[dandv]

@alexx2000: What is the recommended version to run on KDE, the Qt or GTK version?

BTW, I know this is a question, and it would be best suited for the Discussions section of the repo. Would you consider enabling Discussions for this repo?

[elman22]

@dandv KDE Plasma is Qt based desktop environment, so run Qt version. I also tried GTK version and if you have correctly configured GTK theme it looks all right.

[alexx2000]

@dandv, Qt5 of course. I thought about Discussions section, but we have already forum.

[Vascom]

The same problem with doublecmd 1.0.5.
Adding -platform wayland cause crash:

$ doublecmd-qt -platform wayland
SystemLocale ru_RU
SystemLanguage ru
SystemEncoding UTF-8
DefaultSystemCodePage 65001
DefaultFileSystemCodePage 65001
DefaultRTLFileSystemCodePage 65001
[FORMS.PP] ExceptionOccurred 
  Sender=EAccessViolation
  Exception=Access violation
  Stack trace:
  $000000000059F723
  $00000000005EA2B9
  $000000000073E6BD
  $000000000073E09D
  $000000000073A1D3
  $00000000006F3DB1
  $00000000006F3CCB
  $00000000004B228A
[FORMS.PP] ExceptionOccurred 
Warning: Skip libKF5IconThemes exit handler

[alexx2000]

My builds still use Lazarus 2.0.12.

[Vascom]

On my Fedora 35 lazarus 2.0.12 too.

[elman22]

My Arch has Lazarus 2.2.0.4 and DC starts just fine.

[Vascom]

Doublecmd has minimal requred version of lazarus?

[elman22]

If you want to use Wayland platform, yes. You need at least Lazarus 2.2.

[Vascom]

Thanks, it works.

[regs01]

doublecmd -platform wayland

Is this QT-only? Any way to do the same with GTK?

[alexx2000]

Qt only, GTK2 does not support Wayland.

[alexx2000]

DC 1.0.7 is built using Lazarus 2.2.2. Also it executes natively under Wayland by default.