Before this change, insert_from_gap calls treesit_record_change but
insert_from_gap_1 doesn't.  However, insert_from_gap_1 is a public
function and is called in many other places outside of insdel.c.  This
could lead to tree-sitter's parse tree becoming out-of-sync with the
buffer content.

This change might fix bug#60650.

* src/insdel.c (insert_from_gap_1): Call treesit_record_change.
(insert_from_gap): Remove call to treesit_record_change.

* admin/notes/tree-sitter/treesit_record_change: New file.

The start position of the change shouldn't be PT_BYTE, IIUC PT_BYTE is
actually the end position.

* src/insdel.c (insert_from_buffer): Move to here.
(insert_from_buffer_1): Remove call to treesit_record_change.

This fixes bug#58928.  The patch works by moving the
`evaporate_overlays` check closer to `itree_delete_gap`.

* src/buffer.c (adjust_overlays_for_delete_in_buffer): New function,
integrating the functionality of `evaporate_overlays`.
(adjust_overlays_for_delete): Use it.
(evaporate_overlays): Delete function.

* src/buffer.h (evaporate_overlays): Delete declaration.

* src/insdel.c (adjust_markers_for_replace): Minor optimization.
(adjust_after_replace, replace_range, replace_range_2, del_range_2):
Don't call `evaporate_overlays`.

* test/src/buffer-tests.el (buffer-tests--overlays-indirect-evaporate):
Remove the `:expected-result :failed` attribute.

The most obvious problem was the lack of support for
`insert-before-markers`, but the behavior was also different in a few
other cases.

* src/itree.h (itree_insert_gap):
* src/itree.c (itree_insert_gap): Add `before_markers` arg.
* src/lisp.h (adjust_overlays_for_insert):
* src/buffer.c (adjust_overlays_for_insert): Add `before_markers` arg.

* src/insdel.c (adjust_markers_for_replace, adjust_markers_for_insert)
(adjust_markers_for_delete): Adjust overlays directly from here.
(insert_1_both, insert_from_string_1, insert_from_gap)
(insert_from_buffer_1, adjust_after_replace, replace_range)
(replace_range_2, del_range_2): Don't adjust overlays explicitly here
any more.

* test/src/buffer-tests.el (test-overlay-insert-before-markers-empty)
(test-overlay-insert-before-markers-non-empty): New tests.

* src/treesit.c: Rename all ts_* functions and variables to
treesit_*; all references changed.  Fix whitespace.