maintainer-feedback requested: [Bug 242932] x11-toolkits/qt5-gui: QClipboard sometimes fails to paste the image

[bugzilla-noreply at freebsd.org]

Bugzilla Automation <bugzilla at FreeBSD.org> has asked kde at FreeBSD.org for
maintainer-feedback:
Bug 242932: x11-toolkits/qt5-gui: QClipboard sometimes fails to paste the image
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242932



--- Description ---
QClipboard sometimes fails to paste the image that is present in the clipboard.

How to reproduce:
1. Compile the executable 'test' from the attached shar by running 'sh mk.sh'
2. In the Chromium browser go to
https://wooda.co/wp-content/uploads/2018/02/Log-Type-E-Designer-Wooden-Chair-1.
png
It should display the picture of a wooden chair. With right mouse button open
the menu, and select the "Copy image" item
3. Run the executable 'test'
4. It will most likely fail like this:
> $ ./test 
> has image: mime= "TIMESTAMP, TARGETS, SAVE_TARGETS, MULTIPLE, image/png,
text/html, application/x-qt-image"
> INVALID! height=0!

Qt says that the image in the clipboared is zero-sized. However, this X11
command pastes it without a problem:
> xclip -selection clipboard -t image/png -o > x.png

For a comparison, when I do the same in the Firefox browser Qt pastes the image
fine:
> $ ./test 
> has image: mime= "TIMESTAMP, TARGETS, MULTIPLE, SAVE_TARGETS, text/html,
text/_moz_htmlinfo, text/_moz_htmlcontext, image/png, image/bmp, image/x-bmp,
image/x-MS-bmp, image/x-icon, image/x-ico, image/x-win-bitmap,
image/vnd.microsoft.icon, application/ico, image/ico, image/icon, text/ico,
image/jpeg, image/tiff, application/x-qt-image"
> Valid: size= 427 x 600


Curiously, sometimes, every once in 15-20+ times, Qt is able to paste the image
even when Chromium copied it into the clipboard.