Problem: hl_eol requires a multiline extmark to extend the background past end-of-line. The extmark used end_col = line_len on the same row, so it was single-line and hl_eol was effectively a no-op. Solution: replace end_col with end_row targeting the next line so the extmark is multiline and hl_eol takes effect. Split number_hl_group into a separate extmark to prevent it bleeding to adjacent lines. |
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