https://bugs.kde.org/show_bug.cgi?id=364759

            Bug ID: 364759
           Summary: Cannot handle saved files without the corresponding
                    backend  properly.
           Product: cantor
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]

In case the corresponding backend is not installed and the user tries to open a
file produced on another system where this backend was available, Cantor
doesn't handle this case very well. See "steps to reproduce".

Reproducible: Always

Steps to Reproduce:
1. Open a file for a backend that is not available on the system.
2. Cantor reports problems with initializing the modul and the dialog with
"session is being initialized" never disappers. After hitting the cancel button
in this dialog, there is still "computation is running" message in the status
bar. The outputs in the opened file are not shown correctly.


Expected Results:  
Cantor should report the missing backend, show the saved file correctly and
disallow any computations in the worksheet. The file should be opened in the
read-only mode.

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