Wayland crash in KDE Apps

There are two crashes affecting dolphin and gwenview kde apps :

• Dolphin : https://bugs.kde.org/show_bug.cgi?id=411596
• Gwenview: [ https://bugs.kde.org/show_bug.cgi?id=412809|https://bugs.kde.org/show_bug.cgi?id=412809]

They look similar to each other and to QTBUG-61947.

– Backtrace (Reduced):
#7 0x00007fa85f9023eb in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#8 0x00007fa85f8e1899 in __GI_abort () at abort.c:79
#9 0x00007fa85fac92c5 in wl_abort (fmt=fmt@entry=0x7fa85faca0d8 "Error marshalling request: %s\n") at ../src/wayland-util.c:417
#10 0x00007fa85fac526d in wl_proxy_marshal_array_constructor_versioned (proxy=proxy@entry=0x55b3a8c2f030, opcode=opcode@entry=1, args=args@entry=0x7fff033aad90, interface=interface@entry=0x7fa85facdb00 <wl_subsurface_interface>, version=1) at ../src/wayland-client.c:744
#11 0x00007fa85fac529d in wl_proxy_marshal_array_constructor (proxy=proxy@entry=0x55b3a8c2f030, opcode=opcode@entry=1, args=args@entry=0x7fff033aad90, interface=interface@entry=0x7fa85facdb00 <wl_subsurface_interface>) at ../src/wayland-client.c:690

To reproduce with dolphin :

• Hover over a video file and previewing it in the information panel (right)
• Hovering over a non-video file.
• Hovering on a video file.
• Crash occurs.

I will be able to test the fix.