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. |
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