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markdown-ts-mode: hide fence lines in view-mode (bug#81081)

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* lisp/textmodes/markdown-ts-mode.el
(markdown-ts--fontify-delimiter): When `markdown-ts-hide-markup'
is enabled in `markdown-ts-view-mode', also hide the whole line
containing a `fenced_code_block_delimiter' (including its
terminating newline) so Eldoc/LSP markdown snippets render
without stray blank lines around the code block.  Scoped to
view-mode and to fenced delimiters on purpose: the same handler
is shared by inline delimiters (emphasis, code span, link
brackets) where munching surrounding whitespace would collapse
word separators, and tuning rendering for
hide-markup-while-editing is not a goal.
This commit is contained in:
Rahul Martim Juliato 2026-05-19 17:26:09 -03:00 committed by João Távora
parent 133d1d591c
commit aad170d1ed
1 changed files with 21 additions and 2 deletions
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23
lisp/textmodes/markdown-ts-mode.el
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@ -842,8 +842,27 @@ OVERRIDE, START, and END are passed through to
(treesit-node-start node) (treesit-node-end node)
'markdown-ts-delimiter override start end)
(when markdown-ts-hide-markup
(put-text-property (treesit-node-start node) (treesit-node-end node)
'invisible 'markdown-ts--markup)))
(if (and (derived-mode-p 'markdown-ts-view-mode)
(equal (treesit-node-type node) "fenced_code_block_delimiter"))
;; In view-mode only, hide the whole line containing the fence
;; (including its terminating newline) so Eldoc/LSP markdown
;; snippets render without stray blank lines around the code
;; block. Restricted to view-mode because hide-markup while
;; editing already has UX hazards (point movement, backspace
;; across invisible regions) and we should not tune rendering
;; for that mode. Restricted to fenced_code_block_delimiter
;; because the same handler is shared by inline delimiters
;; (emphasis, code span, link brackets) where munching
;; surrounding whitespace would collapse word separators.
(save-excursion
(goto-char (treesit-node-start node))
(let ((bol (pos-bol))
(eol+1 (progn (goto-char (treesit-node-end node))
(min (point-max) (1+ (pos-eol))))))
(put-text-property bol eol+1
'invisible 'markdown-ts--markup)))
(put-text-property (treesit-node-start node) (treesit-node-end node)
'invisible 'markdown-ts--markup))))
(defun markdown-ts--fontify-atx-delimiter (node override start end &rest _)
"Fontify atx_heading delimiter NODE and optionally hide its markup.