Improve documentation and customization of 'derived-mode' in buffer predicate

* doc/lispref/buffers.texi (Buffer List):
* lisp/subr.el (buffer-match-p):
Document that 'derived-mode' can be a list (bug#79481).

* lisp/wid-edit.el (buffer-predicate): Support a list for 'derived-mode'.

doc/lispref/buffers.texi

@@ -991,10 +991,13 @@ Satisfied if @emph{any} condition in @var{conds} satisfies
 Satisfied if @emph{all} the conditions in @var{conds} satisfy
 @code{buffer-match-p}, with the same buffer and @code{args}.
 @item derived-mode
-Satisfied if the buffer's major mode derives from @var{expr}.  Note
-that this condition might fail to report a match if
-@code{buffer-match-p} is invoked before the major mode of the buffer
-has been established.
+Satisfied if the buffer's major mode derives from @var{expr}.
+The value of @var{expr} can be either a single mode symbol
+or a list of mode symbols as accepted by the function
+@code{provided-mode-derived-p} (@pxref{Derived Modes}).
+Note that this condition might fail to report a match if
+@code{buffer-match-p} is invoked before the major mode of
+the buffer has been established.
 @item major-mode
 Satisfied if the buffer's major mode is equal to @var{expr}.  Prefer
 using @code{derived-mode} instead, when both can work.  Note that this

lisp/subr.el

@@ -7651,7 +7651,8 @@ CONDITION is either:
 - a cons-cell, where the car describes how to interpret the cdr.
   The car can be one of the following:
   * `derived-mode': the buffer matches if the buffer's major mode
-    is derived from the major mode in the cons-cell's cdr.
+    is derived from the major mode in the cons-cell's cdr, or from any
+    major mode in the list as accepted by `provided-mode-derived-p'.
   * `major-mode': the buffer matches if the buffer's major mode
     is eq to the cons-cell's cdr.  Prefer using `derived-mode'
     instead when both can work.

lisp/wid-edit.el

@@ -4395,7 +4395,9 @@ is inline."
                  (function :tag "Predicate function")
                  (cons :tag "Derived mode"
                        (const derived-mode)
-                       (symbol derived-mode))
+                       (choice
+                        (symbol :tag "Single mode" derived-mode)
+                        (repeat :tag "List of modes" (symbol derived-mode))))
                  (cons :tag "Major mode"
                        (const major-mode)
                        (symbol major-mode))