Make HIST arg of read-from-minibuffer work with buffer-local vars

* lisp/simple.el (minibuffer-history-values): New function, should be
used to access the minibuffer input history variable when the
minibuffer might be active.  If the variable is buffer-local, the
previous buffer's value will be used.
(goto-history-element): Use the new function to access the minibuffer
history.
(minibuffer-history-isearch-wrap): Use the new function to access the
minibuffer history.
* src/minibuf.c (read_minibuf): Switch to previous buffer temporarily
before updating history list (Bug#38317).
(read-from-minibuffer): Extend documentation to mention that the
result of using the command will be added to the history list by
default.
* doc/lispref/minibuf.texi (Minibuffer History): Mention the
possibility of using a buffer-local variable as history.
* etc/NEWS: Announce changes.

1 files changed, 6 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 20b86173e93..d4f31aeb85d 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -522,6 +522,12 @@ Note that this key binding will not work on MS-Windows systems if
 key binding with an upper case letter - if you can type it, you can
 bind it.
 
++++
+** 'read-from-minibuffer' now works with buffer-local history variables.
+The HIST argument of 'read-from-minibuffer' now works correctly with
+buffer-local variables.  This means that different buffers can have
+their own separated input history list if desired.
+
 
 * Editing Changes in Emacs 27.1