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NOTES ON TREESIT_RECORD_CHANGE
It is vital that Emacs informs tree-sitter of every change made to the
buffer, lest tree-sitter's parse tree would be corrupted/out of sync.
All buffer changes in Emacs are made through functions in insdel.c
(and casefiddle.c), I augmented functions in those files with calls to
treesit_record_change. Below is a manifest of all the relevant
functions in insdel.c as of Emacs 29:
Function Calls
----------------------------------------------------------------------
copy_text (*1)
insert insert_1_both
insert_and_inherit insert_1_both
insert_char insert
insert_string insert
insert_before_markers insert_1_both
insert_before_markers_and_inherit insert_1_both
insert_1_both treesit_record_change
insert_from_string insert_from_string_1
insert_from_string_before_markers insert_from_string_1
insert_from_string_1 treesit_record_change
insert_from_gap_1 treesit_record_change
insert_from_gap insert_from_gap_1
insert_from_buffer treesit_record_change
insert_from_buffer_1 (used by insert_from_buffer) (*2)
replace_range treesit_record_change
replace_range_2 (caller needs to call treesit_r_c)
del_range del_range_1
del_range_1 del_range_2
del_range_byte del_range_2
del_range_both del_range_2
del_range_2 treesit_record_change
(*1) This functions is used only to copy from string to string when
used outside of insdel.c, and when used inside insdel.c, the caller
calls treesit_record_change.
(*2) This function is a static function, and insert_from_buffer is its
only caller. So it should be fine to call treesit_record_change in
insert_from_buffer but not insert_from_buffer_1. I also left a
reminder comment.
As for casefiddle.c, do_casify_unibyte_region and
do_casify_multibyte_region modifies buffer, but they are static
functions and are called by casify_region, which calls
treesit_record_change. Other higher-level functions calls
casify_region to do the work.
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