Description of problem:
The "Printer:" field in the Print dialog doesn't give any feedback as
to what are valid values. 'lpr' apparently is the default,
irrespective of which printer you have set as default in
gnome-print-manager, and the dialog gives no clues as to what type of
information it wants in the field. At the very least there should be a
combobox containing all the printers visible to the system, imo.

What's more is that even if you put something completely ridiculous
like "FO(*$(F*;;: | !!\n\n y'arr i'm a pirate" no error is given.

You knew this part already, but most users don't: whatever is put in
that field is executed. If someone tells my grandma, to use 'rm -rf ~'
as her printer, she's gonna be pissed.


Version-Release number of selected component (if applicable):


How reproducible:
consistently.

Steps to Reproduce:
1. go to file -> print in epiphany
2. put something insane in the Printer: field
3.
  
Actual results:
nothing happens.

Expected results:
a start: "ERROR: that's definitely not a printer. an example of a
valid setting would be...."

ideally: just use the gnome-print-manager settings.


Additional info: