Put command line file names and mouse dragging onto 'file-name-history'

* lisp/dnd.el (dnd-open-local-file): Add file to history.
* lisp/files.el (file-name-history--add): New function (bug#12915).

* lisp/startup.el (command-line-1): Add file to history.

etc/NEWS

@@ -91,6 +91,10 @@ proper pty support that Emacs needs.
 
 * Startup Changes in Emacs 28.1
 
+---
+** File names given on the command line will now be pushed onto
+'file-name-history'.
+
 ---
 ** In GTK builds, Emacs now supports startup notification.
 This means that Emacs won't steal keyboard focus upon startup
@@ -335,6 +339,10 @@ by dragging the tab lines of their topmost windows with the mouse.
 
 * Editing Changes in Emacs 28.1
 
+---
+** Dragging a file to Emacs will now also push the name of the file
+onto 'file-name-history'.
+
 +++
 ** A prefix arg now causes 'delete-other-frames' to only iconify frames.
 

lisp/dnd.el

@@ -180,6 +180,7 @@ An alternative for systems that do not support unc file names is
 	  (if dnd-open-file-other-window
 	      (find-file-other-window f)
 	    (find-file f))
+          (file-name-history--add f)
 	  'private)
       (error "Can not read %s" uri))))
 

lisp/files.el

@@ -1702,6 +1702,10 @@ rather than FUN itself, to `minibuffer-setup-hook'."
   (list (read-file-name prompt nil default-directory mustmatch)
 	t))
 
+(defun file-name-history--add (file)
+  "Add FILE to `file-name-history'."
+  (add-to-history 'file-name-history (abbreviate-file-name file)))
+
 (defun find-file (filename &optional wildcards)
   "Edit file FILENAME.
 Switch to a buffer visiting file FILENAME,

lisp/startup.el

@@ -2391,6 +2391,7 @@ nil default-directory" name)
 				  (command-line-normalize-file-name name)
 				  dir))
 			   (buf (find-file-noselect file)))
+                      (file-name-history--add file)
 		      (setq displayable-buffers (cons buf displayable-buffers))
                       ;; Set the file buffer to the current buffer so
                       ;; that it will be used with "--eval" and