Dear LyX users and developers, Applying background colour to cells or rows in a table with cell borders enabled results in some vertical borders adjacent to the coloured area not being visible in the PDF output.
Environment: LyX 2.4.3 PDF output via LuaLaTeX (TeX Live 2025) Standard LyX table inset The issue seems independent of table content (it occurs even with minimal or empty tables) and whether cell or row background colouring is used. Removing all ERT background colouring restores the vertical borders. A minimal .lyx file demonstrating the behaviour is attached. Documentation: The LyX documentation (Embedded Objects Manual, §2.11 “Colored Tables”) describes table background colouring but does not address its interaction with table borders. Is there a known workaround for this in LyX 2.4.x, and do newer LyX versions handle this case differently? Best, Andy -Andreas Hild
example-table.lyx
Description: application/lyx
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