[Bug 54748] Suggestion Re: Browse dialog doesn't escape spaces in command path

[bcreitz]

Consider a new text field, adjacent to the 'command' field, in which the
user types the command's arguments.  The 'command' field's events can be
set up to escape spaces whenever its contents change, and since the args
will go in a separate field, there is no confusion over which spaces
need escaping--every space in the 'command' field will.  Existing
commands read in from .desktop files will be easily parsed to fit into
the new two-field scheme.

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Browse dialog doesn't escape spaces in command path
https://launchpad.net/bugs/54748