Crashes ("TypeError: standardPixmap(...") when running with qt6ct and Breeze theme #2128
Description
Describe the problem, feature or ask a question:
As reported downstream in the Manjaro forums, I am getting crashes when running Back in Time as a normal user with qt6ct Breeze theme activated.
I use this theme because usually it provides the best look for programs originally developed with Qt for the KDE desktop environment (like Okular e.g.).
I have never experienced inconsistent or unreadable UI element, in comparison to e.g. some Kvantum themes, not to speak of crashes.
Here is what happens when i run it with QT_QPA_PLATFORMTHEME=qt6ct (exported for my login shell, so active by default for all programs):
QT_QPA_PLATFORMTHEME=qt6ct backintime-qt ✔
Back In Time
Version: 1.5.4
Back In Time comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type `backintime --license' for details.
Traceback (most recent call last):
File "/usr/share/backintime/qt/app.py", line 2472, in <module>
mainWindow = MainWindow(cfg, appInstance, qapp)
File "/usr/share/backintime/qt/app.py", line 342, in __init__
SettingsDialog(self).exec()
~~~~~~~~~~~~~~^^^^^^
File "/usr/share/backintime/qt/manageprofiles/__init__.py", line 253, in __init__
self._tab_retention = RemoveRetentionTab(self)
~~~~~~~~~~~~~~~~~~^^^^^^
File "/usr/share/backintime/qt/manageprofiles/tab_remove_retention.py", line 65, in __init__
self._label_rule_execute_order()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/share/backintime/qt/manageprofiles/tab_remove_retention.py", line 177, in _label_rule_execute_order
icon = self.style().standardPixmap(
QStyle.StandardPixmap.SP_MessageBoxInformation)
TypeError: standardPixmap(self, standardPixmap: QStyle.StandardPixmap, opt: Optional[QStyleOption], widget: Optional[QWidget] = None): not enough arguments
I can see the first dialog, that mentions that no configuration has been found.
When i choose to not import and existing one, the crash occurs.
This does not happen if I unset the environment variable QT_QPA_PLATFORMTHEME= backintime-qt.
This is my qt6ct configuration:
[Appearance]
color_scheme_path=/usr/share/qt6ct/colors/airy.conf
custom_palette=false
icon_theme=breeze
standard_dialogs=default
style=Breeze
[Fonts]
fixed="Noto Sans Mono,10,-1,5,400,0,0,0,0,0,0,0,0,0,0,1"
general="Noto Sans,10,-1,5,400,0,0,0,0,0,0,0,0,0,0,1"
[Interface]
activate_item_on_single_click=1
buttonbox_layout=3
cursor_flash_time=1200
dialog_buttons_have_icons=1
double_click_interval=400
gui_effects=@Invalid()
keyboard_scheme=4
menus_have_icons=true
show_shortcuts_in_context_menus=true
stylesheets=@Invalid()
toolbutton_style=4
underline_shortcut=1
wheel_scroll_lines=3
[PaletteEditor]
geometry=@ByteArray(\x1\xd9\xd0\xcb\0\x3\0\0\0\0\x4\x15\0\0\x1\x11\0\0\x6\x8b\0\0\x3\x42\0\0\x4\x15\0\0\x1\x32\0\0\x6\x8b\0\0\x3\x42\0\0\0\0\0\0\0\0\a\x80\0\0\x4\x15\0\0\x1\x32\0\0\x6\x8b\0\0\x3\x42)
[SettingsWindow]
geometry=@ByteArray(\x1\xd9\xd0\xcb\0\x3\0\0\xff\xff\xff\xf5\xff\xff\xff\xcf\0\0\x2\xe9\0\0\x2p\0\0\0\0\0\0\0\0\0\0\x2\xde\0\0\x2\x65\0\0\0\0\0\0\0\0\n\0\0\0\0\0\0\0\0\0\0\0\x2\xde\0\0\x2\x65)
[Troubleshooting]
force_raster_widgets=1
ignored_applications=@Invalid()
And my system info:
# System Details Report
---
## Report details
- **Date generated:** 2025-05-06 13:46:28
## Hardware Information:
- **Hardware Model:** Lenovo Lenovo Yoga C940-14IIL
- **Memory:** 16.0 GiB
- **Processor:** Intel® Core™ i7-1065G7 × 8
- **Graphics:** Intel® Iris® Plus Graphics (ICL GT2)
- **Disk Capacity:** 1.0 TB
## Software Information:
- **Firmware Version:** AUCN57WW
- **OS Name:** Manjaro Linux
- **OS Build:** rolling
- **OS Type:** 64-bit
- **GNOME Version:** 48
- **Windowing System:** Wayland
- **Kernel Version:** Linux 6.6.87-1-MANJARO
If you think that this is not a problem with Backintime but rather with the Breeze theme, feel free to tell me where else I should report it.
Edit: On a side note, this crash doesn't happen when I use the same theme (Breeze) on KDE.
It seems to be specific to Gnome with the Breeze theme.