https://bugs.kde.org/show_bug.cgi?id=385273
Bug ID: 385273
Summary: Dragging QListWidgetItems with icons crashes under
Plasma, not other envs
Product: plasma-integration
Version: 5.10.4
Platform: Mageia RPMs
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 108121
--> https://bugs.kde.org/attachment.cgi?id=108121&action=edit
Backtrace, Qt 5.9.1, KF 5.38, Plasma 5.10.4
I noticed a crash in a program I develop, when dragging certain items (the ones
that have an icon) from a QListWidget to another.
I made a very small proof of concept, here:
https://gitlab.com/bugpocs/WidgetListCrash
The crash looks like this, triggered after dragging one of the items with icon
from the left-side list to the right-side list:
./WidgetListCrash
Trying to construct an instance of an invalid type, type id: 6553705
Trying to construct an instance of an invalid type, type id: 788558336
Trying to construct an instance of an invalid type, type id: 524358
terminate called after throwing an instance of 'std::bad_alloc'
what(): std::bad_alloc
Aborted (core dumped)
Dragging the items with no icon works fine.
I've tested this under Mageia, Debian and Archlinux, some i386, some x86_64,
some under Plasma, some under other environments.
I pondered reporting this to Qt directly, but the crash does NOT happen under
Xfce or Mate, for instance, so I started to suspect KDEPlasmaPlatformTheme.so.
The crash also doesn't happen under Plasma, IF I run the program with
XDG_CURRENT_DESKTOP=something-other-than-KDE. Besides Plasma, the crash also
happens under LXQt, unless doing the above trick.
So basically, it seems like the crash is averted when Qt believes the
environment is GTK-based.
I don't know if this is due to something Qt does "directly", based on some of
the desktop-depending stuff done, or instance, here:
http://code.qt.io/cgit/qt/qtbase.git/tree/src/platformsupport/themes/genericunix/qgenericunixthemes.cpp
http://code.qt.io/cgit/qt/qtbase.git/tree/src/platformsupport/services/genericunix/qgenericunixservices.cpp
... but after talking about this on #kde-devel, I've decided to report it here,
and hopefully the experts will know ;)
Thank you for your time!
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