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Program received signal SIGSEGV, Segmentation fault.
0x00007ffff5c6a7d8 in QFontDatabase::removeAllApplicationFonts() () from /lib64/libQt5Gui.so.5
Missing separate debuginfos, use: debuginfo-install lib64bzip2_1-1.0.6-7.mga5.x86_64 lib64dbus1_3-1.8.10-1.mga5.x86_64 lib64dri-drivers-10.4.0-2rc4.1.mga5.tainted.x86_64 lib64drm2-2.4.58-3.mga5.x86_64 lib64drm_nouveau2-2.4.58-3.mga5.x86_64 lib64drm_radeon1-2.4.58-3.mga5.x86_64 lib64elfutils1-0.160-3.mga5.x86_64 lib64expat1-2.1.0-9.mga5.x86_64 lib64ffi6-3.1-4.mga5.x86_64 lib64fontconfig1-2.11.1-4.mga5.x86_64 lib64freetype6-2.5.4-1.mga5.tainted.x86_64 lib64glapi0-10.4.0-2rc4.1.mga5.tainted.x86_64 lib64glib2.0_0-2.42.1-1.mga5.x86_64 lib64icu53-53.1-8.mga5.x86_64 lib64jpeg8-1.3.1-3.mga5.x86_64 lib64llvm3.5-3.5.0-3.mga5.x86_64 lib64lzma5-5.1.4-0.beta.4.mga5.x86_64 lib64mesagl1-10.4.0-2~rc4.1.mga5.tainted.x86_64 lib64ncurses5-5.9-21.mga5.x86_64 lib64nss-mdns2-0.10-15.mga5.x86_64 lib64pcre1-8.36-2.mga5.x86_64 lib64pcre16_0-8.36-2.mga5.x86_64 lib64png16_16-1.6.15-1.mga5.x86_64 lib64qt5core5-5.4.0-1.mga5.x86_64 lib64qt5dbus5-5.4.0-1.mga5.x86_64 lib64qt5gui5-5.4.0-1.mga5.x86_64 lib64qt5widgets5-5.4.0-1.mga5.x86_64 lib64qtsvg5-5.4.0-1.mga5.x86_64 lib64qtx11extras5-5.4.0-1.mga5.x86_64 lib64txc-dxtn-1.0.1-7.mga5.tainted.x86_64 lib64x11-xcb1-1.6.2-5.mga5.x86_64 lib64x11_6-1.6.2-5.mga5.x86_64 lib64xau6-1.0.8-5.mga5.x86_64 lib64xcb-dri2_0-1.11-3.mga5.x86_64 lib64xcb-dri3_0-1.11-3.mga5.x86_64 lib64xcb-glx0-1.11-3.mga5.x86_64 lib64xcb-icccm4-0.4.1-3.mga5.x86_64 lib64xcb-present_0-1.11-3.mga5.x86_64 lib64xcb-randr0-1.11-3.mga5.x86_64 lib64xcb-render0-1.11-3.mga5.x86_64 lib64xcb-shape0-1.11-3.mga5.x86_64 lib64xcb-shm0-1.11-3.mga5.x86_64 lib64xcb-sync1-1.11-3.mga5.x86_64 lib64xcb-util-image0-0.4.0-1.mga5.x86_64 lib64xcb-util-keysyms1-0.4.0-2.mga5.x86_64 lib64xcb-util-renderutil0-0.3.9-3.mga5.x86_64 lib64xcb-util1-0.4.0-1.mga5.x86_64 lib64xcb-xfixes0-1.11-3.mga5.x86_64 lib64xcb-xkb1-1.11-3.mga5.x86_64 lib64xcb1-1.11-3.mga5.x86_64 lib64xcursor1-1.1.14-5.mga5.x86_64 lib64xdamage1-1.1.4-7.mga5.x86_64 lib64xdmcp6-1.1.1-7.mga5.x86_64 lib64xext6-1.3.3-3.mga5.x86_64 lib64xfixes3-5.0.1-5.mga5.x86_64 lib64xi6-1.7.4-3.mga5.x86_64 lib64xkbcommon0-0.4.3-1.mga5.x86_64 lib64xml2_2-2.9.1-10.mga5.x86_64 lib64xrender1-0.9.8-5.mga5.x86_64 lib64xshmfence1-1.1-3.mga5.x86_64 lib64xxf86vm1-1.1.3-5.mga5.x86_64 lib64yui6-3.1.4-0.git20140826.3.mga5.x86_64 lib64yui6-qt-2.46.13-0.git20140826.2.mga5.x86_64 lib64zlib1-1.2.8-7.mga5.x86_64 libgcc1-4.9.2-4.mga5.x86_64 libstdc++6-4.9.2-4.mga5.x86_64
(gdb) bt
#0 0x00007ffff5c6a7d8 in QFontDatabase::removeAllApplicationFonts() () at /lib64/libQt5Gui.so.5
#1 0x00007ffff5b9e0e1 in QGuiApplication::~QGuiApplication() () at /lib64/libQt5Gui.so.5
#2 0x00007ffff5597123 in QApplication::~QApplication() () at /lib64/libQt5Widgets.so.5
#3 0x00007ffff55972e9 in QApplication::~QApplication() () at /lib64/libQt5Widgets.so.5
#4 0x00007ffff68ec1ca in YQUI::~YQUI() () at /usr/lib64/yui/libyui-qt.so.6
#5 0x00007ffff68ec319 in YQUI::~YQUI() () at /usr/lib64/yui/libyui-qt.so.6
#6 0x00007ffff7b8c4e9 in YUILoader::deleteUI() () at /lib64/libyui.so.6
#7 0x00007ffff6f93312 in __run_exit_handlers () at /lib64/libc.so.6
#8 0x00007ffff6f93365 in () at /lib64/libc.so.6
#9 0x00007ffff6f7cfd7 in __libc_start_main () at /lib64/libc.so.6
#10 0x0000000000401049 in _start () at ../sysdeps/x86_64/start.S:122

Hi. I opened this issue in dnfdragora page at:
manatools/dnfdragora#62

Developer ask me to move discussion about point 1 here.
I'm not sure whether title should be modified here or not ? If need modification, then modify it as it need.

Here is subject:
Hi. Currently, dnfdragora on Fedora has unlogical GUI due to most importantly, size of individual columns are very wide make user unable to see enough amount of descriptions & data ! User need to scroll horizontally for that !

From time to time it seg fault again.
I tried the ManyWidgets example (but aslo other ones).
Just run and close it more time (i run it and pressed ALT-C):
[anaselli@gandalf examples (master)]$ ./Table-many-items
[anaselli@gandalf examples (master)]$ ./Table-many-items
[anaselli@gandalf examples (master)]$ ./Table-many-items
Errore di segmentazione
[anaselli@gandalf examples (master)]$ ./Table-many-items
[anaselli@gandalf examples (master)]$ ./Table-many-items
Errore di segmentazione
[anaselli@gandalf examples (master)]$ ./Table-many-items
Errore di segmentazione
[anaselli@gandalf examples (master)]$
[anaselli@gandalf examples (master)]$ ./Table-many-items
Errore di segmentazione
[anaselli@gandalf examples (master)]$ ./Table-many-items
Errore di segmentazione
[anaselli@gandalf examples (master)]$ ./Table-many-items
[anaselli@gandalf examples (master)]$ ./Table-many-items
[anaselli@gandalf examples (master)]$ ./Table-many-items
Errore di segmentazione
[anaselli@gandalf examples (master)]$ ./Table-many-items
[anaselli@gandalf examples (master)]$

QT behaves differently compared to Gtk implementation.
It prints out the help string and go on launching the application.

Moreover since there is no way to add more help strings to --help option by using YCommandLine
but overwriting it, maybe you could consider to change this option to --help-ui (for both qt and gtk) or --hlep-qt and --help-gtk since ncurses does not have any options or at least it seems not to)

Even when running YaST with QT_QPA_PLATFORM=wayland, it tries to connect to the X server.

By removing the probeX11Display this can be fixed easily.
According to