bug#32766: Wrong syntax colors with backslash in a string (F90 mode)

[Angelo Graziosi]

This code

  program foo
    integer, parameter :: FOO = ichar('\')
    integer, parameter :: BAR = 10
  end program foo

produces wrong color syntax from the comma in the second statement. After the 
first statement the indentation is lost and so the electric-pair-mode etc. 
Other programming modes could be affected.

Maybe we must live with this "issue", so I flag this just for the record...