https://bugs.kde.org/show_bug.cgi?id=408179

--- Comment #34 from vialav <d...@bk.ru> ---
$ cantor

QObject::connect: signal not found in KSelectAction
QObject::connect: signal not found in KToggleAction
QObject::connect: signal not found in QAction
QObject::connect: signal not found in QAction
QObject::connect: signal not found in QAction
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/16/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/22/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/24/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/32/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/48/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/64/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/128/"
dir:  "/usr/lib/x86_64-linux-gnu/qt5/plugins/cantor/backends"
Creating MaximaBackend
Creating NullBackend
Creating PythonBackend
Creating PythonBackend
Creating RBackend
Creating SageBackend
Creating ScilabBackend
dir:  "/usr/bin/cantor/backends"
QObject::connect: signal not found in QListWidget
QObject::connect: signal not found in QListWidget
"Julia" true true
"KAlgebra" true true
"Lua" true true
"Maxima" true true
"nullbackend" false true
"Octave" true true
"Python 2" true true
"Python 3" true true
"Qalculate" true true
"R" true true
"Sage" true true
"Scilab" true true
QObject::connect: signal not found in QDialogButtonBox
QObject::connect: signal not found in QDialogButtonBox
QObject::connect: signal not found in BackendChooseDialog

<I had to close the Cantor backend selection window because neither of two
buttons OK or Cancel worked>

<Now I have an empty window and no backend icons are visible :-( if clicking
File -> New; closing>

<now I start Cantor explicitly with the Julia backend>

$ cantor -b julia # Wow! Julia is working!!! Thank you!:

QObject::connect: signal not found in KSelectAction
QObject::connect: signal not found in KToggleAction
QObject::connect: signal not found in QAction
QObject::connect: signal not found in QAction
QObject::connect: signal not found in QAction
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/16/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/22/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/24/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/32/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/48/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/64/"
Invalid Context= "stock" line for icon theme: 
"/usr/share/icons/ubuntu-mono-dark/stock/128/"
dir:  "/usr/lib/x86_64-linux-gnu/qt5/plugins/cantor/backends"
Creating MaximaBackend
Creating NullBackend
Creating PythonBackend
Creating PythonBackend
Creating RBackend
Creating SageBackend
Creating ScilabBackend
dir:  "/usr/bin/cantor/backends"
Backend  "Julia"  offers extensions:  ("VariableManagementExtension",
"PackagingExtension", "PlotExtension", "ScriptExtension",
"LinearAlgebraExtension")
JuliaSession(0x230efb0) Cantor::VariableManagementExtension(0x2089060, name =
"VariableManagementExtension")
new worksheetaccess interface
loading assistants...
dir:  "/usr/lib/x86_64-linux-gnu/qt5/plugins/cantor/assistants"
plugin  "AdvancedPlot"  is not supported by  "Julia"
plugin  "Create Matrix"  is supported by  "Julia" , requires extensions 
("LinearAlgebraExtension")
QObject::connect: signal not found in QAction
plugin  "Differentiate"  is not supported by  "Julia"
plugin  "Eigenvalues"  is not supported by  "Julia"
plugin  "Eigenvectors"  is not supported by  "Julia"
plugin  "Import Package"  is supported by  "Julia" , requires extensions 
("PackagingExtension")
QObject::connect: signal not found in QAction
plugin  "Integrate"  is not supported by  "Julia"
plugin  "Invert Matrix"  is not supported by  "Julia"
plugin  "Plot2d"  is supported by  "Julia" , requires extensions 
("PlotExtension")
QObject::connect: signal not found in QAction
plugin  "Plot3d"  is supported by  "Julia" , requires extensions 
("PlotExtension")
QObject::connect: signal not found in QAction
plugin  "QalculatePlot"  is not supported by  "Julia"
plugin  "RunScript"  is supported by  "Julia" , requires extensions 
("ScriptExtension")
QObject::connect: signal not found in QAction
plugin  "Solve"  is not supported by  "Julia"
dir:  "/usr/bin/cantor/assistants"
loading panel plugins for session of type  "Julia"
dir:  "/usr/lib/x86_64-linux-gnu/qt5/plugins/cantor/panels"
plugin  "Help"  is supported, requires extensions  ("")
plugin  "Variable Manager"  is supported, requires extensions 
("VariableManagementExtension")
dir:  "/usr/bin/cantor/panels"
Entry Appended
adding panel for  "Help"
adding panel for  "Variable Manager"
ShortcutOverride 16777220 QFlags<Qt::KeyboardModifiers>(ShiftModifier)
julia bindir "/usr/bin"
wsStatusChange 1
login to julia done
wsStatusChange 0
setting result to a type  1  result
update Entry
Entry Appended
wsStatusChange 1
org.kde.knotifications: Audio notification requested, but sound file from
notifyrc file was not found, aborting audio notification
wsStatusChange 2
QProcess: Destroyed while process ("/usr/bin/cantor_juliaserver") is still
running.

<And I also see the backend icons now under File -> New, but only if had been
run first with the -b switch>

<So, interactive backend selection doesn't work, but Julia is back to life. I
think, it is an 80% success.>

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