Description:
(This issue may be design-related rather than a bug, but affects usability and visual consistency.)

When editing a chart in LibreOffice Writer under a dark theme UI, text elements such as chart titles, axis labels, and legend names appear correctly on screen (white on dark background). However, when the document is exported as a PDF, these texts become invisible because the color remains white against a white background.

It seems that “Automatic” text color adapts to the UI theme in the editing view, but this adaptation is not applied during PDF export — the color is exported as-is (white).

Steps to Reproduce:
1. Open LibreOffice Writer (UI theme: Dark Mode enabled).
2. Insert → Chart.
3. Add a chart title and axis labels (keep text color set to “Automatic”).
4. Export the document to PDF.
5. Open the exported PDF and check the chart.

Actual Results:
The text in the chart (titles, labels, legend) is invisible in the exported PDF.

Expected Results:
The automatic text color should adapt to the document background, or be correctly rendered in the PDF output.


Reproducible: Always


User Profile Reset: No

Additional Info:
Workaround:
Manually setting the text color (e.g., black) in the chart resolves the issue.

Environment:
- LibreOffice version: 7.5.3.2 (x86_64)
- OS: Windows 11 Pro (Dark Mode enabled)
- Component: Writer (Chart object)

Suggested Enhancement:
Consider one of the following:
- Make “Automatic” text color theme-aware during PDF export.
- Or, decouple UI theme color from chart element colors to maintain WYSIWYG consistency.