barrett/diffs.nvim
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fix(highlight): use hl_group instead of line_hl_group for diff backgrounds

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line_hl_group bg occupies a separate rendering channel from hl_group in
Neovim's extmark system, causing character-level bg-only highlights to be
invisible regardless of priority. Switching to hl_group + hl_eol ensures
all backgrounds compete in the same channel.

Also reorders priorities (Normal 198 < line bg 199 < syntax 200 < char
bg 201), bumps char-level blend alpha from 0.4 to 0.7 for visibility,
and adds debug logging throughout the intra pipeline.
This commit is contained in:
Barrett Ruth 2026-02-06 18:28:22 -05:00
parent f1c13966ba
commit cc947167c3
5 changed files with 427 additions and 20 deletions
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17
lua/diffs/diff.lua
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@ -312,13 +312,28 @@ function M.compute_intra_hunks(hunk_lines, algorithm)
---@type diffs.CharSpan[]
local all_del = {}
for _, group in ipairs(groups) do
dbg(
'intra: %d change groups, algorithm=%s, vscode=%s',
#groups,
algorithm,
vscode_handle and 'yes' or 'no'
)
for gi, group in ipairs(groups) do
dbg('group %d: %d del lines, %d add lines', gi, #group.del_lines, #group.add_lines)
local ds, as
if vscode_handle then
ds, as = diff_group_vscode(group, vscode_handle)
else
ds, as = diff_group_native(group)
end
dbg('group %d result: %d del spans, %d add spans', gi, #ds, #as)
for _, s in ipairs(ds) do
dbg(' del span: line=%d col=%d..%d', s.line, s.col_start, s.col_end)
end
for _, s in ipairs(as) do
dbg(' add span: line=%d col=%d..%d', s.line, s.col_start, s.col_end)
end
vim.list_extend(all_del, ds)
vim.list_extend(all_add, as)
end