https://bugs.documentfoundation.org/show_bug.cgi?id=168613
Bug ID: 168613
Summary: Overlapping ligature glyphs involving font fallback in
certain languages
Product: LibreOffice
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: graphics stack
Assignee: [email protected]
Reporter: [email protected]
Description:
In certain cases and with certain fonts, CTL text subject to font fallback can
still produce overlapping glyphs. These appear to be ligatures.
Important notes:
- The results are sensitive to the specific font used for fallback. You may see
large differences by changing the text language or the base font.
- This may not reproduce consistently on Windows due to font linking.
Steps to Reproduce:
1. Open attachment 202926, a text file containing the endonyms of various
languages from Wikipedia.
2. Paste the contents without formatting into Writer.
3. Make sure the Western, Asian, and Complex fonts are all set to something
like Noto Sans (not the language-specific subfonts).
4. Note that some of the CTL endonyms are formatted incorrectly (for example,
Burmese).
5. Change the font to a language-specific font. For example, change the Burmese
text to use Noto Sans Myanmar.
6. Note that the text is now rendered correctly.
Actual Results:
Certain CTL text is rendered incorrectly due to font fallback.
Expected Results:
Text should be rendered correctly, even if we have to use font fallback.
Reproducible: Always
User Profile Reset: No
Additional Info:
Version: 25.8.1.1 (X86_64)
Build ID: 54047653041915e595ad4e45cccea684809c77b5
CPU threads: 12; OS: Linux 6.2; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
Calc: threaded
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