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Description
While testing, I discovered that I've introduced a new error with my previous PR #624:
The change in how the value for the 'Exec' key in .desktop files is generated.
I assumed that Exec uses quoting rules identical to shells. However, it does not. Only " can be used for quotes and there are less special characters. shlex.join quotes differently, it uses single quotes ' exclusively which is not compatible with how the Exec key is supposed to be quoted.
I restored the get_exec_line method in installer.py which i previously deleted, and enhanced it instead to conform to the quoting rules as described in The Exec Key.
Sorry about this oversight on my part.
Checklist