[snap] No KDE file dialogs

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The plasma integration regression is tracked by bug #1741074.

Incorrect mouse pointers is also a known issue: bug #1833611.

Let's repurpose this bug to track the problem with KDE file dialogs.

Thanks for the info on other bugs!

For reference, I'm attaching screenshots of a file save dialog in:

 - chromium-browser as a deb package in bionic (kdialog as expected)

 - chromium as a snap in eoan (gtk dialog, not correct)

The chromium implementation of KDE dialogs runs the kdialog binary (see SelectFileDialogImpl::CheckKDEDialogWorksOnUIThread() in https://cs.chromium.org/chromium/src/chrome/browser/ui/libgtkui/select_file_dialog_impl_kde.cc).

The kdialog package and its dependencies would need to be staged in the snap for this to work.

I managed to make chromium use kdialog by staging the kdialog package and its dependencies, and by exporting "QT_PLUGIN_PATH: $SNAP/usr/lib/x86_64-linux-gnu/qt5/plugins" in snapcraft.yaml's environment section for the chromium app.

The problem with this approach is that it adds 60MB to the final compressed size of the snap. Some of it could certainly be excluded, but it will require some careful tuning.

This requires more work.

Any progress/news in this regard? This is still an issue on Ubuntu 20.04, fwiw.

No progress on this. Contributions are welcome, if someone is willing to spend the time to try and shave some megabytes off my prototype that increased the snap's size by 60MB.

+1 I am also being affected by this bug. It is very frustrating, so far moving Chromium to snap on Kubuntu has caused lots of annoying issues for me, definitely a step back.

I am a BIOS developer, willing to help out in any way I can. But this may be too high up the stack for me to be able to fix in a reasonable amount of time.

I guess how much I want to debug this myself directly correlates on how annoyed by it I am. That annoyance is growing...

1. Is it fixed in 20.10?
2. If not, is there a proper package anywhere instead of a broken snap?

I am using Kubuntu 20.10 and this is affecting me as well. It's very weird to have to use Gtk file picker in KDE plasma.

I wouldn't mind an additional 60 MB to have this fixed.