[kmail2] [Bug 414955] KMail stops responding when preview pane active on Wayland-Plasma

[Edward Viesel]

https://bugs.kde.org/show_bug.cgi?id=414955

Edward Viesel <Edward.Viesel at bornepost.eu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|5.14.0                      |5.13.3
                 CC|                            |Edward.Viesel at bornepost.eu
           Platform|Debian testing              |Kubuntu Packages

--- Comment #6 from Edward Viesel <Edward.Viesel at bornepost.eu> ---
I can confirm this bug, or something similar. I'm using Wayland with Kubuntu
20.04. Practically every application works, except the preview in KMail.

With preview disabled, KMail works fine.

With the preview enabled, the whole desktop does a range of strange things:
- it copied (part-)images of the last website I visited on Firefox and also my
desktop image to the preview pane. Sometimes also just a black rectangular.
- then it turned the cursor into a horizontal resizing tool, with KMail,
however, becoming completely unresponsive (but not crashing)
- when I tried to change the settings in KMail, it startet "mixing" the two
windows: the normal message list and the settings window. Parts of the settings
window could be seen, superimposed on parts of the normal message list.
- it was difficult to navigate to minimized windows in the window bar, because
the little rectangulars started to flicker or disappear for a few seconds when
I tried to access them.
- the KMail window resized itself, growing increasingly larger on the
right-hand side with each fresh access, so that the "close" cross couldn't be
accessed for closing the application.

Strangely enough, each time I opened KMail again, the problem was different,
just a whole range of strange behaviours.

Steps to reproduce:
Start Kmail on wayland-plasma with active preview pane in Kubuntu 20.04.

Observed result:
See above; in my case, KMail remains responsive most of the time. If it does go
grey and does not repspond, I can still close it via the icon at the top
right-hand corner. If I can't see that icon (resizing; see above), I can still
move the whole window to get at the cross icon.

Expected result:
Normal message list; stable desktop.

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