https://bugs.documentfoundation.org/show_bug.cgi?id=169621

            Bug ID: 169621
           Summary: Tables with rows and columns filled with background
                    color show blank artifacts in the exported PDF file
           Product: LibreOffice
           Version: 25.8.3.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: [email protected]
          Reporter: [email protected]

Description:
Some tables, whose rows or columns have a background color, show blank lines in
the places where pass the lines/borders of these rows and columns. These blank
lines appear in the exported PDF file.

I hope I was successful in uploading the ODT and its PDF file, so you can
understand what I mean by "blank artifacts". If you can see the PDF file, look
at the Table 3, Table 4, Table 6, Table 9, and Table 10. For example, in the
Table 3, you can see a white line between the fifth and sixth columns; the
Table 6 is the worst case, I don't even need to explain.

It's a bit random, these artifacts may appear in some tables in some exports,
but after some PDF exports, the blank artifacts disappear in these tables, but
start appearing in other tables. The visual bugs may change of place in
different PDF exports, but they are always appearing somewhere in the PDF file!

This problem is not new, it happened in previous versions, in both Windows and
Linux (Flatpak or installed in the traditional way).


----------------------

Version: 25.8.3.2 (X86_64) / LibreOffice Community
Build ID: 8ca8d55c161d602844f5428fa4b58097424e324e
CPU threads: 4; OS: Linux 6.12; UI render: default; VCL: gtk3
Locale: pt-BR (pt_BR.UTF-8); UI: pt-BR
Flatpak
Calc: threaded

Steps to Reproduce:
1. Create multiple tables whose rows and columns are filled with background
color (I've used light gray 4). If you make only a few tables or make all of
them in the same way, you may miss the bug. Make tables in different
configurations, like I did in the attached files.
2. Export the file to PDF

Actual Results:
The generated PDF may show the blank artifacts

Expected Results:
The tables in the exported PDF file shouldn't have these blank artifacts


Reproducible: Always


User Profile Reset: Yes

Additional Info:
I think I already informed everything in the description and title.

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