Change how thread-first/thread-last indent the first argument

* lisp/doc-view.el (doc-view--current-cache-dir): Reindent.

* lisp/emacs-lisp/subr-x.el (thread-first):
(thread-last): Change indentation to match examples.
(internal--build-binding): Reindent.

* test/lisp/emacs-lisp/subr-x-tests.el
(subr-x-test-thread-first-function-names-are-threaded):
(subr-x-test-thread-first-examples):
(subr-x-test-thread-last-function-names-are-threaded):
(subr-x-test-thread-last-examples): Reindent.

lisp/doc-view.el

@@ -727,7 +727,7 @@ It's a subdirectory of `doc-view-cache-directory'."
 	  (file-name-as-directory
 	   (expand-file-name
 	    (concat (thread-last
-                        (file-name-nondirectory doc-view--buffer-file-name)
+                      (file-name-nondirectory doc-view--buffer-file-name)
                       ;; bug#13679
                       (subst-char-in-string ?% ?_)
                       ;; arc-mode concatenates archive name and file name

lisp/emacs-lisp/subr-x.el

@@ -62,7 +62,7 @@ Is equivalent to:
     (+ (- (/ (+ 5 20) 25)) 40)
 Note how the single `-' got converted into a list before
 threading."
-  (declare (indent 1)
+  (declare (indent 0)
            (debug (form &rest [&or symbolp (sexp &rest form)])))
   `(internal--thread-argument t ,@forms))
 
@@ -79,7 +79,7 @@ Is equivalent to:
     (+ 40 (- (/ 25 (+ 20 5))))
 Note how the single `-' got converted into a list before
 threading."
-  (declare (indent 1) (debug thread-first))
+  (declare (indent 0) (debug thread-first))
   `(internal--thread-argument nil ,@forms))
 
 (defsubst internal--listify (elt)
@@ -107,7 +107,7 @@ If ELT is of the form ((EXPR)), listify (EXPR) with a dummy symbol."
 (defun internal--build-binding (binding prev-var)
   "Check and build a single BINDING with PREV-VAR."
   (thread-first
-      binding
+    binding
     internal--listify
     internal--check-binding
     (internal--build-binding-value-form prev-var)))

test/lisp/emacs-lisp/subr-x-tests.el

@@ -455,18 +455,18 @@
   "Test `thread-first' wraps single function names."
   (should (equal (macroexpand
                   '(thread-first 5
-                     -))
+                                 -))
                  '(- 5)))
   (should (equal (macroexpand
                   '(thread-first (+ 1 2)
-                     -))
+                                 -))
                  '(- (+ 1 2)))))
 
 (ert-deftest subr-x-test-thread-first-expansion ()
   "Test `thread-first' expands correctly."
   (should (equal
            (macroexpand '(thread-first
-                             5
+                           5
                            (+ 20)
                            (/ 25)
                            -
@@ -477,13 +477,13 @@
   "Test several `thread-first' examples."
   (should (equal (thread-first (+ 40 2)) 42))
   (should (equal (thread-first
-                     5
+                   5
                    (+ 20)
                    (/ 25)
                    -
                    (+ 40)) 39))
   (should (equal (thread-first
-                     "this-is-a-string"
+                   "this-is-a-string"
                    (split-string "-")
                    (nbutlast 2)
                    (append (list "good")))
@@ -500,18 +500,18 @@
   "Test `thread-last' wraps single function names."
   (should (equal (macroexpand
                   '(thread-last 5
-                     -))
+                                -))
                  '(- 5)))
   (should (equal (macroexpand
                   '(thread-last (+ 1 2)
-                     -))
+                                -))
                  '(- (+ 1 2)))))
 
 (ert-deftest subr-x-test-thread-last-expansion ()
   "Test `thread-last' expands correctly."
   (should (equal
            (macroexpand '(thread-last
-                             5
+                           5
                            (+ 20)
                            (/ 25)
                            -
@@ -522,13 +522,13 @@
   "Test several `thread-last' examples."
   (should (equal (thread-last (+ 40 2)) 42))
   (should (equal (thread-last
-                     5
+                   5
                    (+ 20)
                    (/ 25)
                    -
                    (+ 40)) 39))
   (should (equal (thread-last
-                     (list 1 -2 3 -4 5)
+                   (list 1 -2 3 -4 5)
                    (mapcar #'abs)
                    (cl-reduce #'+)
                    (format "abs sum is: %s"))