'pcmanfm-qt -w <path_to_image>' does update wallpaper only after mouse movement

Description : Lubuntu 20.04 LTS, 64 bit
Release : 20.04
Version pcmanfm-qt : pcmanfm-qt 0.14.1

Dear all.

When executing 'pcmanfm-qt -w <path_to_image_file>' the wallpaper of the desktop gets normally updated by the image <path_to_image_file>.

However, this is not the case on Lubuntu 20.04, 64bit: after execution of the terminal command, the wallpaper image gets only updated when the mouse passes from the terminal window onto the desktop. It is basically the same bug reported on github:

https://github.com/lxqt/pcmanfm-qt/issues/935
https://github.com/lxqt/pcmanfm-qt/pull/936

The bug could be fixed on 11 Apr 2019 by a small change (a single line of C++ code: desktopWin->update();), see here:

https://github.com/lxqt/pcmanfm-qt/pull/936/commits/9f6fe7c87fa428caf9604bbee48b66e989a3d75b

It seems that this fix is not included in the current version of pcmanfm-qt under Lubuntu 20.04, as also discussed today in the IRC #Lubuntu chat (thx guys for your kind help there!).

Please, can we make use of the fix from above and include a new version into the Lubuntu 20.04 system? Thx a lot.

Cheers, Multibrelch.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: pcmanfm-qt 0.14.1-0ubuntu3
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: LXQt
Date: Sat Apr 25 20:55:59 2020
InstallationDate: Installed on 2020-04-24 (1 days ago)
InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: pcmanfm-qt
UpgradeStatus: No upgrade log present (probably fresh install)