feature/tree-sitter e504eabe88 02/12: Change tree-sitter indent anchor preset 'prev-line'

[Yuan Fu]

branch: feature/tree-sitter
commit e504eabe88727141e70ae9793be71d4285f839a5
Author: Yuan Fu <casouri@gmail.com>
Commit: Yuan Fu <casouri@gmail.com>

    Change tree-sitter indent anchor preset 'prev-line'
    
    * doc/lispref/modes.texi: Update manual.
    * lisp/treesit.el (treesit-simple-indent-presets): Change prev-line to
    mean bol of prev-line.
---
 doc/lispref/modes.texi | 4 ++--
 lisp/treesit.el        | 7 ++-----
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/doc/lispref/modes.texi b/doc/lispref/modes.texi
index d6797fe04f..ab83d8712b 100644
--- a/doc/lispref/modes.texi
+++ b/doc/lispref/modes.texi
@@ -4820,8 +4820,8 @@ This anchor returns the start of @var{node}, i.e., no 
indent.
 prev-line
 @end example
 
-This anchor returns the start of the first named node on the previous
-line.  This can be used for indenting an empty line.
+This anchor returns the first non-whitespace charater on the previous
+line.
 @end defvar
 
 @heading Indentation utilities
diff --git a/lisp/treesit.el b/lisp/treesit.el
index 001404d88d..cf586f9978 100644
--- a/lisp/treesit.el
+++ b/lisp/treesit.el
@@ -522,9 +522,7 @@ See `treesit-simple-indent-presets'.")
                    (save-excursion
                      (goto-char bol)
                      (forward-line -1)
-                     (skip-chars-forward " \t")
-                     (treesit-node-start
-                      (treesit-node-at (point) nil t))))))
+                     (skip-chars-forward " \t")))))
   "A list of presets.
 These presets that can be used as MATHER and ANCHOR in
 `treesit-simple-indent-rules'.
@@ -585,8 +583,7 @@ no-indent
 
 prev-line
 
-    Find the named node on the previous line.  This can be used when
-    indenting an empty line: just indent like the previous node.")
+    The first non-whitespace charater on the previous line.")
 
 (defun treesit--simple-apply (fn args)
   "Apply ARGS to FN.