Merge from origin/emacs-29

96af584af6c Fix comment-start-skip in tree-sitter modes (bug#59690)
520a4e12f8e ; * lisp/treesit.el (treesit-end-of-defun): Guard against...
2c4d92d30f6 ; * lisp/subr.el (posn-col-row): Revert inadvertent change.
6fb9a03cbdf ; Remove debugging leftover message
c5ba47c889e Speed up Unicode normalisation tests by a factor of 5
afa4fcb95b4 Fix "C-h k" when clicking on another frame
f6e2f30f394 ; Fix typos
bd58dcedfb9 Fix and expand tests broken by commit 2772ebe366 of 2022-...
a0dd9fdebe3 ; Add cross-reference to string-equal docstring
11c3c54d8ad Fix handling of relative directories in "--init-directory...
401f76cc3d6 Make sure 'user-emacs-directory' ends in a slash