bug#58748: 28.1; proced - filter : wrong-type argument symbolp

[jeff weisberg]

SUMMARY
    setting the proced-filter causes an error

DETAILS
    the docstring for proced-filter says:
      "Current filter of proced listing.
       It can be the car of an element of `proced-filter-alist'.
       It can also be a list of elementary filters as in the cdrs of the 
elements

    but if we do so (using emacs -Q):

      (progn
        (proced)
        (proced-filter-interactive '((args . "bash"))))

    it almost works. it generates the desired filtered list, but then fails:

        Lisp error: (wrong-type-argument symbolp ((args . "bash")))

CAUSE
    in proced.el:proced-update it attempts to update the mode line

        (concat ": " (symbol-name proced-filter))

FIX
    many options. such as:
        - test if proced-filter is a symbol
        - stringify it more robustly





In GNU Emacs 28.1 (build 2, x86_64-apple-darwin17.7.0, NS appkit-1561.61 
Version 10.13.6 (Build 17G14042))
 of 2022-06-02 built on arete.tcp4me.com
Windowing system distributor 'Apple', version 10.3.1561
System Description:  Mac OS X 10.13.6

Configured using:
 'configure --without-carbon --with-x --prefix=/usr/local
 --with-x-toolkit=no --with-gnutls=ifavailable
 --disable-ns-self-contained'

Configured features:
ACL GMP LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER PNG THREADS
TOOLKIT_SCROLL_BARS ZLIB

Important settings:
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Major mode: Text

Minor modes in effect:
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Load-path shadows:
/Users/jaw/.emacs.d/straight/build/transient/transient hides 
/usr/local/share/emacs/28.1/lisp/transient
/Users/jaw/.emacs.d/straight/build/let-alist/let-alist hides 
/usr/local/share/emacs/28.1/lisp/emacs-lisp/let-alist

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