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fix(treesitter): conceal_lines is not applied to injected trees

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Problem:
TSHighlighter._on_conceal_line() parses with the range { row, row }. A
Range2 has an exclusive end, so that is the empty range, and no injected
region ever intercepts it.

The root tree is parsed regardless, because its region is empty, so only
injections are affected: conceal_lines metadata coming from an injected
language's highlights query is dropped. on_range_impl() then records the
row in _conceal_checked, so the miss persists until the buffer changes.

For a markdown code block nested in a markdown code block, the inner
fence delimiters stay visible and nvim_win_text_height() reports 5 rows
where 3 are displayed.

Solution:
Pass the one-row range, as the on_range_impl() call below already does.

AI-assisted
This commit is contained in:
Volodymyr Chernetskyi
2026-09-04 18:25:14 +02:00
committed by Christian Clason
parent 2ac9dfc45d
commit 5f1f5a8c2a
2 changed files with 28 additions and 1 deletions
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runtime/lua/vim/treesitter/highlighter.lua
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@@ -549,7 +549,7 @@ function TSHighlighter._on_conceal_line(_, _, buf, row)
-- Do not affect potentially populated highlight state.
local highlight_states = self._highlight_states
self.tree:parse({ row, row })
self.tree:parse({ row, row + 1 })
self:prepare_highlight_states(row, row)
on_range_impl(self, buf, row, 0, row + 1, 0, false, true)
self._highlight_states = highlight_states