[kwin] [Bug 483645] Drag and drop files to web browser only work for the first file

[NitramO]

https://bugs.kde.org/show_bug.cgi?id=483645

--- Comment #33 from NitramO <m.benjenec at gmail.com> ---
(In reply to NitramO from comment #32)
> Same here! Please fix this issue, it's been here for whole year and it's
> still not fixed...
> 
> For me i can't drag and drop from Dolphin to any app at all... All i see in
> the browser while dragging files is a "not-allowed" pointer. I can only drop
> the file if i try to mess with the search bar or something while dragging
> until the "not-allowed" pointer get replaced by "adding file" one, and then
> when i drop the file it's corrupted, webistes/apps can get the name or info
> about it but the file can't be used/decoded, so for example in Discord when
> i try to send the message, i see the attached file and his name, but when i
> try to send, it shows me an error telling me that the file is corrupt...
> 
> - Operating System: KDE Neon 6.2
> - KDE Plasma Version: 6.3.0
> - KDE Frameworks Version: 6.10.0
> - Qt Version: 6.8.2
> - Kernel Version: 6.8.0-49-generic (64-bit)
> - Graphics Platform: Wayland

Ok, so here is a little update:

Firstly, here is my "new" kinfo since the last updates:
- Operating System: KDE neon 6.3
- KDE Plasma Version: 6.3.4
- KDE Frameworks Version: 6.13.0
- Qt Version: 6.8.3
- Kernel Version: 6.11.0-24-generic (64-bit)
- Graphics Platform: Wayland
- Processors: 20 × 13th Gen Intel® Core™ i7-13700H
- Memory: 31.0 Gio of RAM
- Graphics Processor 1: Intel® Graphics
- Graphics Processor 2: NVIDIA GeForce RTX 4060 Laptop GPU


So, I discovered something: I usually use two external monitors in addition to
my laptop's internal display, but I also have an HDMI switch. When the switch
is "activated," it sends the HDMI signal to a 4K TV, which temporarily changes
the setup from 3 monitors to only the TV, until the switch is "disabled" and
the HDMI signal is cut off.

I noticed that when I only have one monitor connected/active, I don’t
experience any issues with Dolphin drag-and-drop into web apps under Wayland —
everything works as expected. So I'm not sure what's really causing the bug,
but it seems to be related to the combination of Wayland and a multi-monitor
setup.

Can others who are experiencing this bug confirm whether you're also using
multiple monitors? Or is it different for you?

Also, is there anything I can test or try on my system to help you better
understand and fix this bug? Just let me know which commands, tests, or
diagnostics or anything else you'd like me to run and I'll do my best to help
resolve this issue once and for all!

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