Pass region start and end to tree-sitter fontification functions

* doc/lispref/modes.texi (Parser-based Font Lock): Update manual.
* lisp/progmodes/js.el (js--fontify-template-string)
* lisp/progmodes/python.el (python--treesit-fontify-string): Update
function to only fontify within the region.
* lisp/treesit.el (treesit-font-lock-rules): Update docstring.
(treesit-font-lock-fontify-region): Pass START and END to
fontification functions.

1 files changed, 9 insertions, 7 deletions

diff --git a/doc/lispref/modes.texi b/doc/lispref/modes.texi
index c6f848ffb23..c1b092247bd 100644
--- a/doc/lispref/modes.texi
+++ b/doc/lispref/modes.texi
@@ -3979,13 +3979,15 @@ with that face.
 
 @findex treesit-fontify-with-override
 Capture names can also be function names, in which case the function
-is called with 2 arguments: @var{node} and @var{override}, where
-@var{node} is the node itself, and @var{override} is the override
-property of the rule which captured this node.  (If this function
-wants to respect the @var{override} argument, it can use
-@code{treesit-fontify-with-override}.)  Beyond the 2 arguments
-presented, this function should accept more arguments as optional
-arguments for future extensibility.
+is called with 4 arguments: @var{node} and @var{override}, @var{start}
+and @var{end}, where @var{node} is the node itself, @var{override} is
+the override property of the rule which captured this node, and
+@var{start} and @var{end} limits the region in which this function
+should fontify.  (If this function wants to respect the @var{override}
+argument, it can use @code{treesit-fontify-with-override}.)
+
+Beyond the 4 arguments presented, this function should accept more
+arguments as optional arguments for future extensibility.
 
 If a capture name is both a face and a function, the face takes
 priority.  If a capture name is neither a face nor a function, it is